ci: add isolated-tests.yml

[marksvc]

This change is 

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 82.18%. Comparing base (7140f65) to head (e0d73bf).
⚠️ Report is 1 commits behind head on master.
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3478      +/-   ##
==========================================
- Coverage   82.19%   82.18%   -0.01%     
==========================================
  Files         611      611              
  Lines       36449    36449              
  Branches     6000     6005       +5     
==========================================
- Hits        29959    29957       -2     
- Misses       5609     5610       +1     
- Partials      881      882       +1     

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