[VertexAI] Add schema minItems/maxItems test

[paulb777]

#no-changelog

Test for #14671

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[paulb777]

/gemini review

[gemini-code-assist]

Code Review

The code adds a new test case generateContentSchemaItems to verify the minItems and maxItems constraints in the response schema. The test configures a generative model with a schema that specifies an array of city names with a minimum of 3 items and a maximum of 5 items. It then sends a prompt to the model and verifies that the response contains a JSON array with the expected number of cities. Overall, this is a good addition to ensure the proper functioning of the schema validation feature.

Merge Readiness

The code changes introduce a new test case, and the implementation is well-done. I would recommend merging this pull request, but I am unable to directly approve it. Please have others review and approve this code before merging.

[paulb777]

How about allConfigsExceptDeveloperV1? Added in last commit.