Fix Codecov CI

[fepegar]

• Write XML coverage file
• Use Github action to upload coverage

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 84.74%. Comparing base (eeeef74) to head (7e6a6e2).
Report is 138 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1200      +/-   ##
==========================================
- Coverage   87.30%   84.74%   -2.57%     
==========================================
  Files          91       92       +1     
  Lines        5806     5926     +120     
==========================================
- Hits         5069     5022      -47     
- Misses        737      904     +167     

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