Reduce number of locations where warnings are raised.

[tobiasraabe]

Closes #270.

[codecov]

Codecov Report

Merging #278 (2a09621) into main (bec6d2e) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main     #278   +/-   ##
=======================================
  Coverage   96.60%   96.61%           
=======================================
  Files          90       90           
  Lines        7605     7623   +18     
=======================================
+ Hits         7347     7365   +18     
  Misses        258      258           

Flag	Coverage Δ
end_to_end	82.48% <52.63%> (-0.08%)	⬇️
integration	41.23% <10.52%> (-0.08%)	⬇️
unit	69.44% <100.00%> (+0.36%)	⬆️

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Impacted Files	Coverage Δ
src/_pytask/warnings.py	83.00% <100.00%> (+1.18%)	⬆️
tests/test_warnings.py	100.00% <100.00%> (ø)

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