[quick_actions_ios]unskip XCUITests

[hellohuanlin]

It looks like flutter/flutter#169928 has been addressed, so the test should already been passing.

See also: flutter/flutter#170180 (comment)

List which issues are fixed by this PR. You must list at least one issue.

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  Comment: only test change
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[gemini-code-assist]

Code Review

This pull request re-enables the testQuickActionWithFreshStart and testQuickActionWhenAppIsInBackground UI tests in RunnerUITests.swift by removing the temporary XCTSkip statements and their associated comments. There are no review comments, and I have no feedback to provide.