DM-39857: Turn off pytest-flake8 and add ruff configuration

[timj]

Checklist

• ran Jenkins
• added a release note for user-visible changes to doc/changes

[timj]

@mxk62 this is a minor change for pytest-flake8 and ruff but I also fixed up some docstring problems so that the build is clean in nitpick sphinx mode. The build failure is from the pydantic change which I will pin if I can't get lsst/daf_butler#859 merged in time.

[codecov]

Codecov Report

Patch coverage: 100.00% and project coverage change: -0.01 ⚠️

Comparison is base (0feb97d) 78.73% compared to head (ae9860e) 78.72%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #145      +/-   ##
==========================================
- Coverage   78.73%   78.72%   -0.01%     
==========================================
  Files          40       40              
  Lines        3094     3093       -1     
  Branches      524      519       -5     
==========================================
- Hits         2436     2435       -1     
  Misses        568      568              
  Partials       90       90              

Impacted Files	Coverage Δ
python/lsst/ctrl/bps/bps_config.py	94.77% <ø> (ø)
python/lsst/ctrl/bps/bps_reports.py	89.16% <ø> (ø)
python/lsst/ctrl/bps/wms_service.py	85.43% <ø> (ø)
tests/qg_test_utils.py	100.00% <ø> (ø)
tests/test_bps_utils.py	83.33% <ø> (ø)
tests/test_drivers.py	96.15% <ø> (ø)
tests/test_generic_workflow.py	98.84% <ø> (ø)
tests/test_ping.py	93.10% <ø> (ø)
tests/test_pre_transform.py	94.59% <ø> (ø)
tests/test_quantum_clustering_funcs.py	98.19% <ø> (ø)
... and 7 more

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