refactor(vertexai): Decommission VertexAI Generation text tags

[Kef131]

Description

Fixes #
b/530250785

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

Removed decommissioned VertexAI region tag and references

• generativeaionvertexai_non_stream_text_basic
• generativeaionvertexai_gemini_generate_from_text_input

Which will remove samples

• https://docs.cloud.google.com/vertex-ai/generative-ai/docs/samples/googlegenaisdk-textgen-chat-with-txt#:~:text=import%20(%20%22context%22%20%22fmt,ClientConfig%7B%20HTTPOptions%3A%20genai
• https://docs.cloud.google.com/vertex-ai/generative-ai/docs/samples/generativeaionvertexai-gemini-generate-from-text-input

in a next CL

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 removes the snippet region tags from QuestionAnswer.java and TextInput.java. There are no review comments, so I have no feedback to provide.

[amcolin]

LGTM

[snippet-bot]

Here is the summary of changes.

You are about to delete 2 region tags.

• vertexai/snippets/src/main/java/vertexai/gemini/QuestionAnswer.java:19, tag generativeaionvertexai_non_stream_text_basic
• vertexai/snippets/src/main/java/vertexai/gemini/TextInput.java:19, tag generativeaionvertexai_gemini_generate_from_text_input

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