skip coverage on forks

[michaelmckinsey1]

Description

• Currently, dryruns always appear as failure on forks because the coverage step will always fail. This skips coverage on forks, so we can still easily tell if the unit tests are passing.

I made a demo PR #1388 to show this works (this is the same PR but from a fork) and the tests are skipped there.

[michaelmckinsey1]

example of skipped action https://github.com/llnl/benchpark/actions/runs/27431826487/job/81084394453?pr=1388

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 64.36%. Comparing base (2b08198) to head (65d1193).
⚠️ Report is 1 commits behind head on develop.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #1387      +/-   ##
===========================================
+ Coverage    62.82%   64.36%   +1.54%     
===========================================
  Files           49       49              
  Lines         3822     3822              
  Branches       339      339              
===========================================
+ Hits          2401     2460      +59     
+ Misses        1402     1343      -59     
  Partials        19       19              

see 2 files with indirect coverage changes

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