Rework the clean command.

[tobiasraabe]

Closes #146.

Changes

• Ignore files tracked by git.

[codecov]

Codecov Report

Merging #273 (69e95df) into main (9e9c1bc) will increase coverage by 0.08%.
The diff coverage is 97.45%.

@@            Coverage Diff             @@
##             main     #273      +/-   ##
==========================================
+ Coverage   96.50%   96.59%   +0.08%     
==========================================
  Files          88       89       +1     
  Lines        7502     7568      +66     
==========================================
+ Hits         7240     7310      +70     
+ Misses        262      258       -4     

Flag	Coverage Δ
end_to_end	82.63% <97.45%> (+0.23%)	⬆️
integration	41.31% <34.74%> (-0.13%)	⬇️
unit	69.09% <39.83%> (-0.37%)	⬇️

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Impacted Files	Coverage Δ
src/_pytask/git.py	92.85% <92.85%> (ø)
src/_pytask/clean.py	93.19% <95.23%> (+1.83%)	⬆️
src/_pytask/config.py	98.18% <100.00%> (ø)
src/_pytask/shared.py	96.10% <100.00%> (ø)
tests/test_clean.py	100.00% <100.00%> (ø)
src/_pytask/capture.py	90.95% <0.00%> (+0.54%)	⬆️
src/_pytask/mark/structures.py	93.33% <0.00%> (+1.39%)	⬆️

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