ci: get code coverage from python test scripts too (#40)

[Shadow53]

Resolves #40.

This adds running the integration tests with the nightly compiler, which allows for generating profiling data from the integration tests and using that to determine code coverage.

[netlify]

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[codecov]

Codecov Report

Merging #41 (7eebcf1) into main (6356167) will increase coverage by 11.99%.
The diff coverage is 100.00%.

@@             Coverage Diff             @@
##             main      #41       +/-   ##
===========================================
+ Coverage   57.14%   69.14%   +11.99%     
===========================================
  Files          17       23        +6     
  Lines        2084     3056      +972     
  Branches      532        0      -532     
===========================================
+ Hits         1191     2113      +922     
- Misses        536      943      +407     
+ Partials      357        0      -357     

Impacted Files	Coverage Δ
src/config/builder/hoard.rs	90.32% <100.00%> (+21.47%)	⬆️
src/main.rs	2.56% <0.00%> (-1.61%)	⬇️
src/config/hoard.rs	0.72% <0.00%> (-0.86%)	⬇️
src/filters/mod.rs	0.00% <0.00%> (ø)
src/checkers/history/mod.rs	0.00% <0.00%> (ø)
tests/lib.rs	100.00% <0.00%> (ø)
tests/config/precedence_conflict/mod.rs	85.71% <0.00%> (ø)
src/filters/ignore.rs	0.00% <0.00%> (ø)
src/checkers/history/operation.rs	0.00% <0.00%> (ø)
src/config/mod.rs	29.11% <0.00%> (+8.61%)	⬆️
... and 13 more

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