Improve output validation/upload logging

[cortadocodes]

Contents (#691)

Enhancements

• Improve output validation/upload logging

Fixes

• Avoid attempting to upload output manifest if it's None

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 94.66%. Comparing base (9092646) to head (2a5a0f7).
Report is 104 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #691      +/-   ##
==========================================
+ Coverage   94.50%   94.66%   +0.16%     
==========================================
  Files          83       83              
  Lines        3547     3598      +51     
==========================================
+ Hits         3352     3406      +54     
+ Misses        195      192       -3     

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