docs(batch): introduce basic snippets

[coryan]

This change is 

[codecov]

Codecov Report

Patch coverage has no change and project coverage change: -0.01 ⚠️

Comparison is base (61c66e9) 93.66% compared to head (4097533) 93.66%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #11915      +/-   ##
==========================================
- Coverage   93.66%   93.66%   -0.01%     
==========================================
  Files        1838     1838              
  Lines      166523   166523              
==========================================
- Hits       155976   155971       -5     
- Misses      10547    10552       +5     

see 3 files with indirect coverage changes

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[snippet-bot]

Here is the summary of changes.

You are about to add 18 region tags.

• google/cloud/batch/v1/samples/samples.cc:17, tag batch_create_script_job
• google/cloud/batch/v1/samples/samples.cc:18, tag batch_create_container_job
• google/cloud/batch/v1/samples/samples.cc:19, tag batch_create_script_job_with_bucket
• google/cloud/batch/v1/samples/samples.cc:20, tag batch_create_job_with_template
• google/cloud/batch/v1/samples/samples.cc:21, tag batch_get_job
• google/cloud/batch/v1/samples/samples.cc:22, tag batch_get_task
• google/cloud/batch/v1/samples/samples.cc:23, tag batch_list_jobs
• google/cloud/batch/v1/samples/samples.cc:24, tag batch_list_tasks
• google/cloud/batch/v1/samples/samples.cc:25, tag batch_delete_job
• google/cloud/batch/v1/samples/samples.cc:59, tag batch_create_container_job
• google/cloud/batch/v1/samples/samples.cc:115, tag batch_create_script_job
• google/cloud/batch/v1/samples/samples.cc:169, tag batch_create_script_job_with_bucket
• google/cloud/batch/v1/samples/samples.cc:229, tag batch_create_job_with_template
• google/cloud/batch/v1/samples/samples.cc:279, tag batch_get_job
• google/cloud/batch/v1/samples/samples.cc:301, tag batch_get_task
• google/cloud/batch/v1/samples/samples.cc:324, tag batch_list_jobs
• google/cloud/batch/v1/samples/samples.cc:345, tag batch_list_tasks
• google/cloud/batch/v1/samples/samples.cc:368, tag batch_delete_job

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