[Firebase AI] Refactor SPT integration tests to Swift Testing

[andrewheard]

• Refactored ServerPromptTemplateIntegrationTests from XCTest to Swift Testing.
  • Prepared the tests for parameterization.
• Added the keychain-access-groups entitlement to fix Keychain access on macOS (needed for App Check).

#no-changelog

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[gemini-code-assist]

Code Review

This pull request does a great job of refactoring the ServerPromptTemplateIntegrationTests from XCTest to the new Swift Testing framework. The adoption of parameterized tests and the #require and #expect macros has significantly cleaned up the test code, making it more concise and readable. The addition of the keychain-access-groups entitlement is also a necessary fix for running on macOS. I have a few suggestions to further improve the code.

[paulb777]

Thanks!