fix: Adding region tag with product prefix

[debi-ch]

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

[snippet-bot[bot]]

Here is the summary of changes.

You are about to add 1 region tag.

- [jobs/v3/api_client/commute_search_sample.py:27](https://github.com/debi-ch/python-docs-samples/blob/a0610da5c670d612a903d661d2264a2fc452696b/jobs/v3/api_client/commute_search_sample.py#L27), tag `job_discovery_commute_search`

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