cleanup: Remove migrated files

[charlieyu1996]

Target PR: GoogleCloudPlatform/java-docs-samples#7402

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[snippet-bot]

Here is the summary of changes.

You are about to delete 18 region tags.

• samples/snippets/src/main/java/com/example/jobs/CommuteSearchJobs.java:19, tag job_search_commute_search
• samples/snippets/src/main/java/com/example/jobs/CustomRankingSearchJobs.java:19, tag job_search_custom_ranking_search
• samples/snippets/src/main/java/com/example/jobs/HistogramSearchJobs.java:19, tag job_search_histogram_search
• samples/snippets/src/main/java/com/example/jobs/JobSearchAutoCompleteJobTitle.java:19, tag job_search_autocomplete_job_title
• samples/snippets/src/main/java/com/example/jobs/JobSearchCreateClientEvent.java:19, tag job_search_create_client_event
• samples/snippets/src/main/java/com/example/jobs/JobSearchCreateCompany.java:19, tag job_search_create_company_beta
• samples/snippets/src/main/java/com/example/jobs/JobSearchCreateJob.java:19, tag job_search_create_job_beta
• samples/snippets/src/main/java/com/example/jobs/JobSearchCreateJobCustomAttributes.java:19, tag job_search_create_job_custom_attributes
• samples/snippets/src/main/java/com/example/jobs/JobSearchCreateTenant.java:19, tag job_search_create_tenant_beta
• samples/snippets/src/main/java/com/example/jobs/JobSearchDeleteCompany.java:19, tag job_search_delete_company_beta
• samples/snippets/src/main/java/com/example/jobs/JobSearchDeleteJob.java:19, tag job_search_delete_job_beta
• samples/snippets/src/main/java/com/example/jobs/JobSearchDeleteTenant.java:19, tag job_search_delete_tenant_beta
• samples/snippets/src/main/java/com/example/jobs/JobSearchGetCompany.java:19, tag job_search_get_company_beta
• samples/snippets/src/main/java/com/example/jobs/JobSearchGetJob.java:19, tag job_search_get_job_beta
• samples/snippets/src/main/java/com/example/jobs/JobSearchGetTenant.java:19, tag job_search_get_tenant_beta
• samples/snippets/src/main/java/com/example/jobs/JobSearchListCompanies.java:19, tag job_search_list_companies_beta
• samples/snippets/src/main/java/com/example/jobs/JobSearchListJobs.java:19, tag job_search_list_jobs
• samples/snippets/src/main/java/com/example/jobs/JobSearchListTenants.java:19, tag job_search_list_tenants_beta

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