Various small code quality cleanups

[matmair]

Various cleanups that were recommended from our SAST tooling.

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[codecov]

Codecov Report

Attention: Patch coverage is 33.33333% with 4 lines in your changes missing coverage. Please review.

Project coverage is 84.05%. Comparing base (be2beec) to head (5c94999).
Report is 322 commits behind head on master.

Files with missing lines	Patch %	Lines
src/frontend/src/tables/settings/GroupTable.tsx	0.00%	2 Missing ⚠️
src/backend/InvenTree/InvenTree/tracing.py	0.00%	1 Missing ⚠️
src/backend/InvenTree/stock/models.py	50.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #7626      +/-   ##
==========================================
+ Coverage   84.01%   84.05%   +0.04%     
==========================================
  Files        1095     1095              
  Lines       48165    48165              
  Branches     1490     1489       -1     
==========================================
+ Hits        40464    40487      +23     
+ Misses       7306     7276      -30     
- Partials      395      402       +7     

Flag	Coverage Δ
backend	85.27% <33.33%> (ø)
pui	66.17% <33.33%> (+0.32%)	⬆️

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[SchrodingersGat]

@matmair appreciated :)