cleanup: remove obsolete function calling samples

[angelcaamal]

Description

Removes obsolete Function Calling samples that are no longer in use or referenced in the documentation.

Changes

• Deleted decommissioned Function Calling sample files.
• Removed corresponding tests and references.

Fixes Internal: b/537369086

Note: Before submitting a pull request, please open an issue for discussion if you are not associated with Google.

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 several files and tests related to Generative AI Function Calling, specifically deleting the basic and streaming function calling implementation files along with their corresponding test suites. As there are no review comments, no further feedback is provided.

[amcolin]

LGTM, No active references to this files 👍

[snippet-bot]

Here is the summary of changes.

You are about to delete 2 region tags.

• generative-ai/snippets/function-calling/functionCallingBasic.js:15, tag generativeaionvertexai_function_calling_basic
• generative-ai/snippets/function-calling/functionCallingStreamContent.js:15, tag generativeaionvertexai_gemini_function_calling_content

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