ci: add workflow that will upload code coverage after a merge to main

[btrautmann]

Description

I noticed on previous PRs that Codecov reports were not showing the diff in coverage compared to main because it couldn't find previously uploaded reports because we squash commits, therefore changing the sha on main and causing Codecov being unable to associate the commits on main with previous uploads. By uploading them for the latest sha on main it will now be able to find them.

I went with this approach as opposed to adding a push trigger to the main workflow because that one does format and analyze which we don't need to do.

Type of Change

• ✨ New feature (non-breaking change which adds functionality)
• 🛠️ Bug fix (non-breaking change which fixes an issue)
• ❌ Breaking change (fix or feature that would cause existing functionality to change)
• 🧹 Code refactor
• ✅ Build configuration change
• 📝 Documentation
• 🗑️ Chore

[Kirpal]

💯

[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (main@d928855). Click here to learn what that means.
The diff coverage is n/a.

@@           Coverage Diff            @@
##             main       #65   +/-   ##
========================================
  Coverage        ?   100.00%           
========================================
  Files           ?        12           
  Lines           ?       506           
  Branches        ?         0           
========================================
  Hits            ?       506           
  Misses          ?         0           
  Partials        ?         0           

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