refactor(vertexai): decommission ControlledGenerationSchema6.java VertexAI sample file

[Kef131]

Description

Fixes #
b/531793648

Reference Migration Map Doc: go/migration-map-vertexai-java

Removed decommissioned VertexAI region tag and references

• generativeaionvertexai_gemini_controlled_generation_response_schema_6

Related samples are already deprecated

• https://docs.cloud.google.com/vertex-ai/generative-ai/docs/samples/generativeaionvertexai-gemini-controlled-generation-response-schema-6

Checklist

Testing

• I have tested this change on a live environment and verified it works as intended.
• Tests pass: mvn clean verify required
• Lint passes: mvn -P lint checkstyle:check required
• Static Analysis: mvn -P lint clean compile pmd:cpd-check spotbugs:check advisory only

Compliance & Style

• I have followed Sample Format Guide
• pom.xml parent set to latest shared-configuration
• Appropriate changes to README are included in PR
• 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

Post-Approval Actions

• Please merge this PR for me once it is approved

[gemini-code-assist]

Code Review

This pull request deletes the ControlledGenerationSchema6.java file, which contained a Java sample demonstrating controlled generation with a JSON schema using the Gemini model. There are no review comments, and I have no feedback to provide.

[XrossFox]

LGTM

[snippet-bot]

Here is the summary of changes.

You are about to delete 1 region tag.

• vertexai/snippets/src/main/java/vertexai/gemini/ControlledGenerationSchema6.java:19, tag generativeaionvertexai_gemini_controlled_generation_response_schema_6

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