feature #57518 Unify how --format is handled by commands (fabpot)

This PR was merged into the 7.2 branch.

Discussion
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Unify how --format is handled by commands

| Q             | A
| ------------- | ---
| Branch?       | 7.2
| Bug fix?      | no
| New feature?  | yes <!-- please update src/**/CHANGELOG.md files -->
| Deprecations? | yes <!-- please update UPGRADE-*.md and src/**/CHANGELOG.md files -->
| Issues        | n/a <!-- prefix each issue number with "Fix #", no need to create an issue if none exists, explain below instead -->
| License       | MIT

We have many commands that have a `--format` option. This PR tries to unify the way we handle them:

* Deprecate the `text` format (used only twice) in favor of the more common `txt` one;
* Add auto-completion for `--format` in all commands;
* Add help about the `--format` option in all commands that supports it (in a unified way)

**Side note**: To avoid confusion, I think we should rename the `--format` option for the `uuid:generate` and `ulid:generate` commands as it does something different from the commonly used `--format` option.

Commits
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848f855cdf Unify how --format is handle by commands

Author: fabpot

Command/DebugCommand.php

@@ -272,6 +272,7 @@ private function completeOptions(string $class, CompletionSuggestions $suggestio
         $suggestions->suggestValues($resolvedType->getOptionsResolver()->getDefinedOptions());
     }
 
+    /** @return string[] */
     private function getAvailableFormatOptions(): array
     {
         return (new DescriptorHelper())->getFormats();