DM-40573: Ensure checks of non-webDAV endpoints return False instead of raising

[airnandez]

Checklist

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

[codecov]

Codecov Report

Patch coverage: 100.00% and project coverage change: +0.06% 🎉

Comparison is base (4bb9eea) 85.91% compared to head (60708eb) 85.97%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #64      +/-   ##
==========================================
+ Coverage   85.91%   85.97%   +0.06%     
==========================================
  Files          27       27              
  Lines        3927     3930       +3     
  Branches      805      805              
==========================================
+ Hits         3374     3379       +5     
+ Misses        433      432       -1     
+ Partials      120      119       -1     

Files Changed	Coverage Δ
python/lsst/resources/http.py	81.22% <100.00%> (+0.35%)	⬆️
tests/test_http.py	94.98% <100.00%> (+0.03%)	⬆️

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[timj]

Looks great.