BigQuery IT test with null optional and empty repeated values

[RustedBones]

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 63.12%. Comparing base (6ebf9c4) to head (fdbbfc3). Report is 28 commits behind head on main.

:exclamation: Current head fdbbfc3 differs from pull request most recent head 12d2ba9. Consider uploading reports for the commit 12d2ba9 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5040      +/-   ##
==========================================
+ Coverage   62.69%   63.12%   +0.42%     
==========================================
  Files         301      286      -15     
  Lines       10848    10743     -105     
  Branches      773      791      +18     
==========================================
- Hits         6801     6781      -20     
+ Misses       4047     3962      -85     

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[RustedBones]

See https://github.com/googleapis/java-bigquerystorage/issues/2284