Chore: Add new region tag

[aliciawilliams]

Add new region tag as part of migration (quickstart -> job_search_quick_start_python)

Description

Internal: b/347825842

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

Checklist

• [X] I have followed Sample Guidelines from AUTHORING_GUIDE.MD
• [ ] README is updated to include all relevant information
• [ ] Tests pass: nox -s py-3.9 (see Test Environment Setup)
• [ ] Lint pass: nox -s lint (see Test Environment Setup)
• [ ] 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
• [X] Please merge this PR for me once it is approved

[snippet-bot[bot]]

Here is the summary of changes.

You are about to add 1 region tag.

- [jobs/v3/api_client/quickstart.py:17](https://github.com/GoogleCloudPlatform/python-docs-samples/blob/c81dd26738f8475b49f079306eeb4c5f706dc901/jobs/v3/api_client/quickstart.py#L17), tag `job_search_quick_start_python`

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