docs: an example to extract Cloud Batch logs

[coryan]

This change is 

[codecov]

Codecov Report

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

Comparison is base (ceacd6b) 93.67% compared to head (1d2ea81) 93.66%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #11935      +/-   ##
==========================================
- Coverage   93.67%   93.66%   -0.01%     
==========================================
  Files        1838     1838              
  Lines      166694   166694              
==========================================
- Hits       156143   156137       -6     
- Misses      10551    10557       +6     

see 6 files with indirect coverage changes

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[snippet-bot]

Here is the summary of changes.

You are about to add 2 region tags.

• examples/batch_logging.cc:17, tag batch_job_logs
• examples/batch_logging.cc:45, tag batch_job_logs

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