chore(job): migrate region step 3 - remove regions in jobs/v3/api_client/base_job_sample.py

[eapl-gemugami]

Description

Fixes Internal:
b/347349725
b/347350189
b/347825769

Checklist

• 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
• Please merge this PR for me once it is approved

[snippet-bot]

Here is the summary of possible violations 😱

There is a possible violation for removing region tag in use.

• jobs/v3/api_client/base_job_sample.py:60, tag create_job(usage: page 1).

The end of the violation section. All the stuff below is FYI purposes only.

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Here is the summary of changes.

You are about to delete 5 region tags.

• jobs/v3/api_client/base_job_sample.py:33, tag basic_job
• jobs/v3/api_client/base_job_sample.py:60, tag create_job
• jobs/v3/api_client/base_job_sample.py:95, tag update_job
• jobs/v3/api_client/base_job_sample.py:118, tag update_job_with_field_mask
• jobs/v3/api_client/base_job_sample.py:140, tag delete_job

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[eapl-gemugami]

The source code for document https://cloud.google.com/talent-solution/job-search/v3/docs/create-company-job was already fixed in cl/648955387 by yoshifumi.

Reviewer: Please take a look into that doc to check if setvar sample_id also needs to be changed from create_basic_job to job_create_job before merging this PR.
Rather than that I don't see any other usage of region_tag create_job as the snippet-box suggests.