feat(bigquery): add statement_type to PostQueryResults

[sachinpro]

Adds statement_type to PostQueryResults in bigquery_v2_minimal_internal to parse the statementType field returned by BigQuery's jobs.query API.

[gemini-code-assist]

Code Review

This pull request adds support for the statement_type field in PostQueryResults. The field is parsed from and serialized to JSON, included in the debug string representation, and integrated into the corresponding unit tests and test utilities. There are no review comments to address, and I have no additional feedback to provide.

[sachinpro]

Hey @dbolduc, thanks for approving this.

Can you please also /gcbrun before merging?

[dbolduc]

/gcbrun

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 92.29%. Comparing base (5fe64b3) to head (2eee6e8).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #16443      +/-   ##
==========================================
+ Coverage   92.26%   92.29%   +0.03%     
==========================================
  Files        2246     2246              
  Lines      212913   212927      +14     
==========================================
+ Hits       196445   196522      +77     
+ Misses      16468    16405      -63     

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[sachinpro]

@dbolduc, @scotthart , I added a commit to fix code coverage. Please /gcbrun again.

[dbolduc]

/gcbrun