CI cleanup

[justsmth]

Description of changes:

• Cleanup of CI, removing no-longer-accurate comments.
• More caution about using the -Wno-overriding-t-option option for the FIPS build.

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license and the ISC license.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 92.89%. Comparing base (c358484) to head (12ff214).
Report is 137 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #634      +/-   ##
==========================================
- Coverage   95.80%   92.89%   -2.91%     
==========================================
  Files          61       67       +6     
  Lines        8143     9717    +1574     
  Branches        0     9717    +9717     
==========================================
+ Hits         7801     9027    +1226     
- Misses        342      402      +60     
- Partials        0      288     +288     

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