fixit: migrate to new region tag with prefix 'job_'

[ymotongpoo]

Description

• Internal: b/347825844
• Internal: b/347825952
• Internal: b/347825964
• Internal: b/347825934

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

Checklist

• [x] I have followed Contributing Guidelines from CONTRIBUTING.MD
• [x] Tests pass: go test -v ./.. (see Testing)
• [x] Code formatted: gofmt (see Formatting)
• [x] Vetting pass: go vet (see Formatting)
• [ ] 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 possible violations 😱

There are 7 possible violations for removing region tag in use.

• jobs/v3/howto/basic_company_sample.go:27, tag create_company(usage: page 1 page 2).
• jobs/v3/howto/basic_company_sample.go:59, tag get_company(usage: page 1).
• jobs/v3/howto/custom_attribute_sample.go:28, tag custom_attribute_job(usage: page 1 page 2).
• jobs/v3/howto/custom_attribute_sample.go:61, tag custom_attribute_filter_string_value(usage: page 1).
• jobs/v3/howto/custom_attribute_sample.go:112, tag custom_attribute_filter_long_value(usage: page 1).
• jobs/v3/howto/custom_attribute_sample.go:163, tag custom_attribute_filter_multi_attributes(usage: page 1).
• jobs/v3/howto/location_based_search_sample.go:209, tag keyword_location_search(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 add 5 region tags.

• jobs/v3/howto/location_based_search_sample.go:26, tag job_basic_location_search
• jobs/v3/howto/location_based_search_sample.go:87, tag job_city_location_search
• jobs/v3/howto/location_based_search_sample.go:149, tag job_broadening_location_search
• jobs/v3/howto/location_based_search_sample.go:213, tag job_keyword_location_search
• jobs/v3/howto/location_based_search_sample.go:276, tag job_multi_locations_search

You are about to delete 17 region tags.

• jobs/v3/howto/basic_company_sample.go:27, tag create_company
• jobs/v3/howto/basic_company_sample.go:59, tag get_company
• jobs/v3/howto/basic_company_sample.go:89, tag update_company
• jobs/v3/howto/basic_company_sample.go:120, tag update_company_with_field_mask
• jobs/v3/howto/basic_company_sample.go:153, tag delete_company
• jobs/v3/howto/basic_company_sample.go:180, tag list_companies
• jobs/v3/howto/basic_job_sample.go:87, tag update_job
• jobs/v3/howto/basic_job_sample.go:118, tag update_job_with_field_mask
• jobs/v3/howto/basic_job_sample.go:151, tag delete_job
• jobs/v3/howto/basic_job_sample.go:178, tag list_jobs
• jobs/v3/howto/custom_attribute_sample.go:28, tag custom_attribute_job
• jobs/v3/howto/custom_attribute_sample.go:61, tag custom_attribute_filter_string_value
• jobs/v3/howto/custom_attribute_sample.go:112, tag custom_attribute_filter_long_value
• jobs/v3/howto/custom_attribute_sample.go:163, tag custom_attribute_filter_multi_attributes
• jobs/v3/howto/location_based_search_sample.go:26, tag basic_location_search
• jobs/v3/howto/location_based_search_sample.go:209, tag keyword_location_search
• jobs/v3/howto/location_based_search_sample.go:272, tag multi_locations_search

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[iennae]

based on snippet checks, a couple of the snippets need to be a 2-phase where you add the region tag in this PR, submit the CL, wait for doc to get merged, then remove the existing region tag.

[ymotongpoo]

@iennae thank you for your review. given cl/648538021 is submitted, can I delete the corresponding old tags from this PR?