Switch to codecov

[sanders41]

Closes #2181, #2182, #2183

Code Changes

• Switch code climate to codecov
• Changed README coverage badge to codecov

Steps to Confirm

• The codecov comment shows no coverage because it uses main as the baseline for change in coverage, and because there has been no run on main yet there is nothing to compare to. The coverage for this branch can be viewed at https://app.codecov.io/github/ethyca/fides/tree/ps-codecov
• Make sure references to code climate on the README.md have been replaced with codecov

Pre-Merge Checklist

• All CI Pipelines Succeeded
• Documentation:
  • documentation complete, PR opened in fidesdocs
  • documentation issue created in fidesdocs
• Issue Requirements are Met
• Relevant Follow-Up Issues Created
• Update CHANGELOG.md

Description Of Changes

After #2342 and getting migrations excluded from coverage we are above the 85% coverage mark.

[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (main@159b235). Click here to learn what that means.
Patch has no changes to coverable lines.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2402   +/-   ##
=======================================
  Coverage        ?   88.55%           
=======================================
  Files           ?      327           
  Lines           ?    15714           
  Branches        ?     4348           
=======================================
  Hits            ?    13915           
  Misses          ?     1644           
  Partials        ?      155           

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[SteveDMurphy]

It looks like there may be some remaining code climate items in constants.py lines 41-43, ci_nox.py lines 187-189, and all of fix_coverage.py

[SteveDMurphy]

Left a couple of comments around some lingering code climate items but this looks great!
Excited to see how it looks in PRs once we get some other things merged to main. Last thing might just be to add something to changelog.md as well (since we mention code climate in there too for the previous PR)

[sanders41]

Thanks @SteveDMurphy for finding the extra code climate spots I missed! 🔍