Check pre-commit hooks in CI

[ulgens]

Adds prek workflow to CI so pre-commit hooks are automatically checked.

This is currently checked by an external service that we have no control over. I also think that there are other issues with the service - a summary of those issues can be found here: j178/prek#621 (comment) This PR can also be used as a pre-commit to prek migration, for the same reasons described at django/djangoproject.com#2252

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (a895084) to head (0d5ed34).
⚠️ Report is 2 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff            @@
##            master      #186   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           11        11           
  Lines          400       400           
  Branches        54        54           
=========================================
  Hits           400       400           

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[browniebroke]

I thought this would already be covered by pre-commit.ci?

[ulgens]

@browniebroke Yep, sorry. The PR needs a better description. Updated now.