[Vertex AI] Read golden files from vertexai subdirectory

[andrewheard]

Added a subdirectory parameter to GenerativeModelTests.httpRequestHandler(...) to handle the new directory structure of the Vertex AI golden files (mock responses) being introduced in FirebaseExtended/vertexai-sdk-test-data#30. The Vertex AI-specific files now reside in a vertexai subdirectory.

Note: Needed to switch from process to copy in Package.swift in order to retain the directory structure, which avoids duplicate file errors. Unlike process, copy doesn't flatten the resources into the top level.

#no-changelog

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[paulb777]

Test failures

[paulb777]

nvm, I see the note in FirebaseExtended/vertexai-sdk-test-data#30

[andrewheard]

Test failures

nvm, I see the note in FirebaseExtended/vertexai-sdk-test-data#30

Fortunately this situation hasn't come up too often despite us not being versioned like JS / Android. I'll kick off the CI re-runs as soon as it gets merged.