Fix spelling error in comments

[rakshityadav1868]

Thank you for contributing to Harbor!

Comprehensive Summary of your change

Fixed spelling mistake coverd → covered in test docstring and comments

• Well Written Title and Summary of the PR
• Label the PR as needed. "release-note/ignore-for-release, release-note/new-feature, release-note/update, release-note/enhancement, release-note/community, release-note/breaking-change, release-note/docs, release-note/infra, release-note/deprecation"
• Accepted the DCO. Commits without the DCO will delay acceptance.
• Made sure tests are passing and test coverage is added if needed.
• Considered the docs impact and opened a new docs issue or PR with docs changes if needed in website repository.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 66.04%. Comparing base (18f7abd) to head (f241146).

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #23217   +/-   ##
=======================================
  Coverage   66.04%   66.04%           
=======================================
  Files        1074     1074           
  Lines      116799   116799           
  Branches     2955     2955           
=======================================
+ Hits        77139    77142    +3     
+ Misses      35378    35375    -3     
  Partials     4282     4282           

Flag	Coverage Δ
unittests	66.04% <ø> (+<0.01%)	⬆️

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see 6 files with indirect coverage changes

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[chlins]

lgtm