fix: removed old region tag

[debi-ch]

/removed old region tag commute_search

Description

Fixes b/347825771

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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

[debi-ch]

commit message on this was incorrectly named - should be 'fix: removed old region tag' - can someone edit this?

[snippet-bot[bot]]

Here is the summary of changes.

You are about to delete 1 region tag.

- [jobs/v3/api_client/commute_search_sample.py:29](https://github.com/GoogleCloudPlatform/python-docs-samples/blob/30e2f91911bab69efb826a4e96e45d6ebf76ad43/jobs/v3/api_client/commute_search_sample.py#L29), tag `commute_search`

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