chore(vertexai): Remove controlled generation response schema region tags

[amcolin]

Description

Fixes Internal b/527153083 and b/527154093

Checklist

• I have followed Contributing Guidelines from CONTRIBUTING.MD
• Tests pass: go test -v ./.. (see Testing)
• Code formatted: gofmt (see Formatting)
• Vetting pass: go vet (see Formatting)
• These samples need a new API enabled in testing projects to pass (let us know which ones)
• These samples need a new/updated env vars in testing projects set to pass (let us know which ones)
• This sample adds a new sample directory, and I updated the CODEOWNERS file with the codeowners for this sample
• This sample adds a new Product API, and I updated the Blunderbuss issue/PR auto-assigner with the codeowners for this sample
• Please merge this PR for me once it is approved

[gemini-code-assist]

Code Review

This pull request removes region tags from controlledgen_schema6.go and controlledgen_schema_enum.go, and skips the corresponding tests in controlledgen_schema_test.go with a message indicating they are waiting to decommission vertexai. There are no review comments, and I have no feedback to provide.

[Kef131]

LGTM

[XrossFox]

LGTM

[snippet-bot]

Here is the summary of changes.

You are about to delete 2 region tags.

• vertexai/controlled-generation/controlledgen_schema6.go:17, tag generativeaionvertexai_gemini_controlled_generation_response_schema_6
• vertexai/controlled-generation/controlledgen_schema_enum.go:17, tag generativeaionvertexai_gemini_controlled_generation_response_schema_7

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