minor #3139 Add --json flag to composer config command (Kocal)

This PR was merged into the 2.x branch.

Discussion
----------

 Add --json flag to composer config command

| Q              | A
| -------------- | ---
| Bug fix?       | no
| New feature?   | no <!-- please update src/**/CHANGELOG.md files -->
| Deprecations?  | no <!-- if yes, also update UPGRADE-*.md and src/**/CHANGELOG.md -->
| Documentation? | yes <!-- required for new features, or documentation updates -->
| Issues         | Fix #... <!-- prefix each issue number with "Fix #", no need to create an issue if none exist, explain below instead -->
| License        | MIT

<!--
Replace this notice by a description of your feature/bugfix.
This will help reviewers and should be a good start for the documentation.

Additionally (see https://symfony.com/releases):
 - Always add tests and ensure they pass.
 - For new features, provide some code snippets to help understand usage.
 - Features and deprecations must be submitted against branch main.
 - Update/add documentation as required (we can help!)
 - Changelog entry should follow https://symfony.com/doc/current/contributing/code/conventions.html#writing-a-changelog-entry
 - Never break backward compatibility (see https://symfony.com/bc).
-->

Follows #3091 and symfony/flex#1064

Commits
-------

92f37a9 Add --json flag to composer config command

Author: Kocal

src/Autocomplete/assets/README.md

@@ -14,7 +14,7 @@ composer require symfony/ux-autocomplete:2.23.0
 npm add @symfony/[email protected]
 ```
 
-**Tip:** Your `package.json` file will be automatically modified by [Flex](https://github.com/symfony/flex) when installing or upgrading a PHP package. To prevent this behavior, ensure to **use at least Flex 1.22.0 or 2.5.0**, and run `composer config "extra.symfony/flex.synchronize_package_json" false`.
+**Tip:** Your `package.json` file will be automatically modified by [Flex](https://github.com/symfony/flex) when installing or upgrading a PHP package. To prevent this behavior, ensure to **use at least Flex 1.22.0 or 2.5.0**, and run `composer config --json "extra.symfony/flex.synchronize_package_json" false`.
 
 ## Resources
 

src/Chartjs/assets/README.md

@@ -14,7 +14,7 @@ composer require symfony/ux-chartjs:2.23.0
 npm add @symfony/[email protected]
 ```
 
-**Tip:** Your `package.json` file will be automatically modified by [Flex](https://github.com/symfony/flex) when installing or upgrading a PHP package. To prevent this behavior, ensure to **use at least Flex 1.22.0 or 2.5.0**, and run `composer config "extra.symfony/flex.synchronize_package_json" false`.
+**Tip:** Your `package.json` file will be automatically modified by [Flex](https://github.com/symfony/flex) when installing or upgrading a PHP package. To prevent this behavior, ensure to **use at least Flex 1.22.0 or 2.5.0**, and run `composer config --json "extra.symfony/flex.synchronize_package_json" false`.
 
 ## Resources
 

src/Cropperjs/assets/README.md

@@ -14,7 +14,7 @@ composer require symfony/ux-cropperjs:2.23.0
 npm add @symfony/[email protected]
 ```
 
-**Tip:** Your `package.json` file will be automatically modified by [Flex](https://github.com/symfony/flex) when installing or upgrading a PHP package. To prevent this behavior, ensure to **use at least Flex 1.22.0 or 2.5.0**, and run `composer config "extra.symfony/flex.synchronize_package_json" false`.
+**Tip:** Your `package.json` file will be automatically modified by [Flex](https://github.com/symfony/flex) when installing or upgrading a PHP package. To prevent this behavior, ensure to **use at least Flex 1.22.0 or 2.5.0**, and run `composer config --json "extra.symfony/flex.synchronize_package_json" false`.
 
 ## Resources
 

src/Dropzone/assets/README.md

@@ -14,7 +14,7 @@ composer require symfony/ux-dropzone:2.23.0
 npm add @symfony/[email protected]
 ```
 
-**Tip:** Your `package.json` file will be automatically modified by [Flex](https://github.com/symfony/flex) when installing or upgrading a PHP package. To prevent this behavior, ensure to **use at least Flex 1.22.0 or 2.5.0**, and run `composer config "extra.symfony/flex.synchronize_package_json" false`.
+**Tip:** Your `package.json` file will be automatically modified by [Flex](https://github.com/symfony/flex) when installing or upgrading a PHP package. To prevent this behavior, ensure to **use at least Flex 1.22.0 or 2.5.0**, and run `composer config --json "extra.symfony/flex.synchronize_package_json" false`.
 
 ## Resources
 

src/LazyImage/assets/README.md

@@ -14,7 +14,7 @@ composer require symfony/ux-lazy-image:2.23.0
 npm add @symfony/[email protected]
 ```
 
-**Tip:** Your `package.json` file will be automatically modified by [Flex](https://github.com/symfony/flex) when installing or upgrading a PHP package. To prevent this behavior, ensure to **use at least Flex 1.22.0 or 2.5.0**, and run `composer config "extra.symfony/flex.synchronize_package_json" false`.
+**Tip:** Your `package.json` file will be automatically modified by [Flex](https://github.com/symfony/flex) when installing or upgrading a PHP package. To prevent this behavior, ensure to **use at least Flex 1.22.0 or 2.5.0**, and run `composer config --json "extra.symfony/flex.synchronize_package_json" false`.
 
 ## Resources
 

src/LiveComponent/assets/README.md

@@ -14,7 +14,7 @@ composer require symfony/ux-live-component:2.23.0
 npm add @symfony/[email protected]
 ```
 
-**Tip:** Your `package.json` file will be automatically modified by [Flex](https://github.com/symfony/flex) when installing or upgrading a PHP package. To prevent this behavior, ensure to **use at least Flex 1.22.0 or 2.5.0**, and run `composer config "extra.symfony/flex.synchronize_package_json" false`.
+**Tip:** Your `package.json` file will be automatically modified by [Flex](https://github.com/symfony/flex) when installing or upgrading a PHP package. To prevent this behavior, ensure to **use at least Flex 1.22.0 or 2.5.0**, and run `composer config --json "extra.symfony/flex.synchronize_package_json" false`.
 
 ## Resources
 

src/Map/src/Bridge/Google/assets/README.md

@@ -14,7 +14,7 @@ composer require symfony/ux-google-map:2.23.0
 npm add @symfony/[email protected]
 ```
 
-**Tip:** Your `package.json` file will be automatically modified by [Flex](https://github.com/symfony/flex) when installing or upgrading a PHP package. To prevent this behavior, ensure to **use at least Flex 1.22.0 or 2.5.0**, and run `composer config extra.symfony.flex.synchronize_package_json false`.
+**Tip:** Your `package.json` file will be automatically modified by [Flex](https://github.com/symfony/flex) when installing or upgrading a PHP package. To prevent this behavior, ensure to **use at least Flex 1.22.0 or 2.5.0**, and run `composer config --json "extra.symfony/flex.synchronize_package_json" false`.
 
 ## Resources
 

src/Map/src/Bridge/Leaflet/assets/README.md

@@ -14,7 +14,7 @@ composer require symfony/ux-leaflet-map:2.23.0
 npm add @symfony/[email protected]
 ```
 
-**Tip:** Your `package.json` file will be automatically modified by [Flex](https://github.com/symfony/flex) when installing or upgrading a PHP package. To prevent this behavior, ensure to **use at least Flex 1.22.0 or 2.5.0**, and run `composer config extra.symfony.flex.synchronize_package_json false`.
+**Tip:** Your `package.json` file will be automatically modified by [Flex](https://github.com/symfony/flex) when installing or upgrading a PHP package. To prevent this behavior, ensure to **use at least Flex 1.22.0 or 2.5.0**, and run `composer config --json "extra.symfony/flex.synchronize_package_json" false`.
 
 ## Resources
 

src/Notify/assets/README.md

@@ -14,7 +14,7 @@ composer require symfony/ux-notify:2.23.0
 npm add @symfony/[email protected]
 ```
 
-**Tip:** Your `package.json` file will be automatically modified by [Flex](https://github.com/symfony/flex) when installing or upgrading a PHP package. To prevent this behavior, ensure to **use at least Flex 1.22.0 or 2.5.0**, and run `composer config "extra.symfony/flex.synchronize_package_json" false`.
+**Tip:** Your `package.json` file will be automatically modified by [Flex](https://github.com/symfony/flex) when installing or upgrading a PHP package. To prevent this behavior, ensure to **use at least Flex 1.22.0 or 2.5.0**, and run `composer config --json "extra.symfony/flex.synchronize_package_json" false`.
 
 ## Resources
 

src/React/assets/README.md

@@ -14,7 +14,7 @@ composer require symfony/ux-react:2.23.0
 npm add @symfony/[email protected]
 ```
 
-**Tip:** Your `package.json` file will be automatically modified by [Flex](https://github.com/symfony/flex) when installing or upgrading a PHP package. To prevent this behavior, ensure to **use at least Flex 1.22.0 or 2.5.0**, and run `composer config "extra.symfony/flex.synchronize_package_json" false`.
+**Tip:** Your `package.json` file will be automatically modified by [Flex](https://github.com/symfony/flex) when installing or upgrading a PHP package. To prevent this behavior, ensure to **use at least Flex 1.22.0 or 2.5.0**, and run `composer config --json "extra.symfony/flex.synchronize_package_json" false`.
 
 ## Resources