[AI] Add an implicit caching unit test

[paulb777]

Add a new unit test based on the new mock test data added in FirebaseExtended/vertexai-sdk-test-data#57

#no-changelog

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[paulb777]

/gemini review

[gemini-code-assist]

Code Review

This pull request adds a new unit test for implicit caching functionality. The test is well-structured and uses mock data to verify the parsing of the API response, including caching-related fields. I've added a couple of minor suggestions to make the test assertions even more comprehensive and readable. Overall, this is a good addition to the test suite.

[paulb777]

Integration test failure addressed by #15730

[andrewheard]

Thanks!