Improve codecov setup

[sergiught]

🔧 Changes

Stabilizes the codecov settings to make them more reliable.

📚 References

🔬 Testing

📝 Checklist

• All new/changed/fixed functionality is covered by tests (or N/A)
• I have added documentation for all new/changed functionality (or N/A)

[sergiught]

This is related to: https://community.codecov.com/t/upload-issues-unable-to-locate-build-via-github-actions-api/3954

[codecov-commenter]

Codecov Report

Patch coverage has no change and project coverage change: +1.01 🎉

Comparison is base (23869cf) 50.44% compared to head (d87a704) 51.46%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #678      +/-   ##
==========================================
+ Coverage   50.44%   51.46%   +1.01%     
==========================================
  Files          93       93              
  Lines       11771    11771              
==========================================
+ Hits         5938     6058     +120     
+ Misses       5405     5278     -127     
- Partials      428      435       +7     

see 4 files with indirect coverage changes

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[willvedd]

Looks like it's reporting a diff compared to an older commit but I'm inclined to chalk that up as an oddity. This PR still provides value as-is.