feat(ci): validate all config yamls in CI

[jordancarlin]

Adds a new do target (./do test:cfgs) to run udb validate cfg on all config files in the cfg directory. This found issues in several existing config files, which are also corrected in this PR.

I also added the new target to the standard regress.yml GitHub Action CI job to make sure all of the config files stay valid.

[jordancarlin]

Very strange. This is working locally, but the GitHub Actions run seems to indicate that it failed to find the sudo and singularity commands. I'm running ./.github/actions/singularity-setup, which should install Singularity, and I have no idea how sudo would be missing.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 46.05%. Comparing base (7e57cf3) to head (052ac83).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1260   +/-   ##
=======================================
  Coverage   46.05%   46.05%           
=======================================
  Files          11       11           
  Lines        4942     4942           
  Branches     1345     1345           
=======================================
  Hits         2276     2276           
  Misses       2666     2666           

Flag	Coverage Δ
idlc	46.05% <ø> (ø)

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