[url_launcher_ios] Fix test button text to work on iOS 26

[jmagman]

Handle either a "Done" (iOS 18) or a "Close" (iOS 26) button:

iOS 26 simulator:

Remove validation of UI elements (ForwardButton, Share) that the plugin doesn't control.
Fixes flutter/flutter#173100

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Code Review

This pull request updates the iOS UI tests to handle different button labels for the 'Done' button in SFSafariViewController across different iOS versions. The change correctly uses an NSPredicate to find the button. However, the review identifies two points for improvement: the changelog entry could be clearer for public consumption, and assertions for other UI elements have been removed from the test, which reduces test coverage without explanation. These should be either restored or their removal justified.

[LongCatIsLooong]

Does the CI run this test on xcode 26, or I should manually verify this change?

[jmagman]

I tested this in a PR draft running Xcode 26 beta 5 #9748. I rebased that branch onto this one. It failed before, but now passes:

Testing started
Successfully ran iOS xctest for packages/url_launcher/url_launcher_ios/example

[packages/url_launcher/url_launcher_ios completed in 1m 29s]

https://logs.chromium.org/logs/flutter/buildbucket/cr-buildbucket/8706532896630430321/+/u/Run_package_tests/native_test/stdout