Reduce number of test query threads

[benjaminwinger]

Seems to significantly slow down our tests as they work with many small operations on systems with many processors. Particularly when running many tests in parallel, it seems unnecessary to use the default number of threads.

Testing to see what the speedup is for CI Seems like an improvement compared to the last time CI was this quiet; oddly windows doesn't seem any different from the previous run, but that machine doesn't have as many threads, and is running much faster since I stopped the antivirus from scanning the test database files anyway.

[codecov]

Codecov Report

Attention: 43 lines in your changes are missing coverage. Please review.

Comparison is base (fc71a74) 89.58% compared to head (9af0a2f) 89.69%.
Report is 3 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2228      +/-   ##
==========================================
+ Coverage   89.58%   89.69%   +0.11%     
==========================================
  Files        1006     1008       +2     
  Lines       36313    35830     -483     
==========================================
- Hits        32530    32139     -391     
+ Misses       3783     3691      -92     

Files	Coverage Δ
src/binder/bind/bind_copy.cpp	94.83% <100.00%> (ø)
src/binder/bind/bind_create_macro.cpp	100.00% <100.00%> (+10.00%)	⬆️
src/binder/bind/bind_ddl.cpp	98.48% <100.00%> (+1.03%)	⬆️
src/binder/bind/bind_file_scan.cpp	98.46% <100.00%> (+1.44%)	⬆️
src/binder/bind/bind_graph_pattern.cpp	96.19% <100.00%> (+1.47%)	⬆️
src/binder/bind/bind_reading_clause.cpp	95.61% <100.00%> (-0.04%)	⬇️
src/binder/bind/bind_updating_clause.cpp	95.48% <100.00%> (ø)
...inder/bind_expression/bind_property_expression.cpp	93.33% <100.00%> (ø)
src/binder/binder.cpp	97.70% <100.00%> (-0.04%)	⬇️
src/binder/expression_binder.cpp	97.50% <100.00%> (-0.07%)	⬇️
... and 62 more

... and 5 files with indirect coverage changes

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[mewim]

is running much faster since I stopped the antivirus from scanning the test database files anyway

LOL. I did not expect this to be the root cause of the slowdown.