chore: Delete CODEOWNERS

[kdmccormick]

See: openedx/axim-engineering#1511

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 97.60%. Comparing base (01faf5a) to head (9c643d2).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #691   +/-   ##
=======================================
  Coverage   97.60%   97.60%           
=======================================
  Files         152      152           
  Lines        1337     1337           
  Branches      233      233           
=======================================
  Hits         1305     1305           
  Misses         31       31           
  Partials        1        1           

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