Fix bug in GBQ batching

[Licenser]

Pull request

Description

When using batches with GBQ where the data wasn't stored.

Checklist

• The RFC, if required, has been submitted and approved
• Any user-facing impact of the changes is reflected in docs.tremor.rs
• The code is tested
• Use of unsafe code is reasoned about in a comment
• Update CHANGELOG.md appropriately, recording any changes, bug fixes, or other observable changes in behavior
• The performance impact of the change is measured (see below)

Performance

-/-

[codecov]

Codecov Report

Merging #2342 (19afe0a) into main (bfe12a7) will increase coverage by 0.05%.
The diff coverage is 100.00%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2342      +/-   ##
==========================================
+ Coverage   90.96%   91.02%   +0.05%     
==========================================
  Files         275      275              
  Lines       58649    58652       +3     
==========================================
+ Hits        53350    53386      +36     
+ Misses       5299     5266      -33     

Flag	Coverage Δ
unittests	91.02% <100.00%> (+0.05%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files Changed	Coverage Δ
src/connectors/impls/gbq/writer/sink.rs	96.13% <100.00%> (-0.08%)	⬇️

... and 9 files with indirect coverage changes

---

Continue to review full report in Codecov by Sentry.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update bfe12a7...19afe0a. Read the comment docs.

[darach]

LGTM 👍