chore: Skip CodeCov upload for non-member PRs

[scouten-adobe]

(We don't have access to the CodeCov token, which means the upload will likely be rate-limited and fail.)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 41.79%. Comparing base (17863bd) to head (6497fdc).
Report is 25 commits behind head on main.

❗ There is a different number of reports uploaded between BASE (17863bd) and HEAD (6497fdc). Click for more details.

HEAD has 9 uploads less than BASE

Flag	BASE (17863bd)	HEAD (6497fdc)
	12	3

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #263      +/-   ##
==========================================
- Coverage   48.68%   41.79%   -6.89%     
==========================================
  Files           4        4              
  Lines         684      756      +72     
==========================================
- Hits          333      316      -17     
- Misses        351      440      +89     

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