chore(vertexai): Decommission inference region tags

[angelcaamal]

Description

This PR decommissions the inference region tags from Vertex AI samples.

Fixes Internal: b/528029726

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Checklist

• I have followed guidelines from CONTRIBUTING.MD and Samples Style Guide
• Tests pass: npm test (see Testing)
• Lint pass: npm run lint (see Style)
• Required CI tests pass (see CI testing)
• 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 pull request is from a branch created directly off of GoogleCloudPlatform/nodejs-docs-samples. Not a fork.
• This sample adds a new sample directory, and I updated the CODEOWNERS file with the codeowners for this sample
• This sample adds a new sample directory, and I created GitHub Actions workflow 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

Note: Any check with (dev), (experimental), or (legacy) can be ignored and should not block your PR from merging (see CI testing).

[gemini-code-assist]

Code Review

This pull request removes the snippet region tags ([START ...] and [END ...]) from several JavaScript files in the generative-ai/snippets/inference/ directory, including nonStreamMultiModalityBasic.js, nonStreamTextBasic.js, streamMultiModalityBasic.js, and streamTextBasic.js. There are no review comments to address, and I have no additional feedback to provide.

[snippet-bot]

Here is the summary of changes.

You are about to delete 4 region tags.

• generative-ai/snippets/inference/nonStreamMultiModalityBasic.js:15, tag generativeaionvertexai_non_stream_multimodality_basic
• generative-ai/snippets/inference/nonStreamTextBasic.js:15, tag generativeaionvertexai_non_stream_text_basic
• generative-ai/snippets/inference/streamMultiModalityBasic.js:15, tag generativeaionvertexai_stream_multimodality_basic
• generative-ai/snippets/inference/streamTextBasic.js:15, tag generativeaionvertexai_stream_text_basic

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