[Firebase AI] Fix Google AI useLimitedUseAppCheckTokens config

[andrewheard]

• Fixed the googleAI_v1beta_appCheckLimitedUse InstanceConfig in the Firebase AI Logic integration tests.

  • This configuration was previously using standard tokens.
  • This config was showing as (copy) to signify that it was identical to the other.
    

• Simplified nil checking in LiveSessionsTests with try #require(...) instead of guard let ... else { Issue.record(...) } pattern.

• Fixed location formatting in test case naming.

  • googleAI_v1beta_appCheckLimitedUse now shows Google AI (v1beta) - FAC Limited-Use
  

#no-changelog

[gemini-code-assist]

Code Review

This pull request introduces several improvements to the Firebase AI integration tests. The main fix correctly configures the googleAI_v1beta_appCheckLimitedUse test instance to use limited-use App Check tokens, which was the primary goal. Additionally, the code is refactored to use the try #require(...) pattern from the Swift Testing framework, simplifying nil-checking and making the tests more concise. The PR also enhances readability by improving test case naming for different configurations and clarifying a TODO comment. Overall, these are solid changes that improve the correctness and maintainability of the test suite.

[gemini-code-assist]

Code Review

This pull request correctly fixes the useLimitedUseAppCheckTokens configuration for Google AI integration tests and improves the codebase by simplifying nil-checking with #require and enhancing test case name formatting. The changes are clear and well-aligned with the PR's description. I've added one minor suggestion for consistency in string handling within the test setup.