[release-3.6] github/workflows: remove coverage workflow

[k8s-infra-cherrypick-robot]

This is an automated cherry-pick of #19424

/assign ivanvc

[k8s-ci-robot]

Hi @k8s-infra-cherrypick-robot. Thanks for your PR.

I'm waiting for a etcd-io member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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[ivanvc]

/ok-to-test

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 68.92%. Comparing base (bcfe983) to head (922dfbf).
Report is 7 commits behind head on release-3.6.

Additional details and impacted files

see 32 files with indirect coverage changes

@@               Coverage Diff               @@
##           release-3.6   #19648      +/-   ##
===============================================
+ Coverage        68.89%   68.92%   +0.02%     
===============================================
  Files              420      420              
  Lines            35787    35744      -43     
===============================================
- Hits             24656    24636      -20     
+ Misses            9701     9678      -23     
  Partials          1430     1430              

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[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: ahrtr, ivanvc, k8s-infra-cherrypick-robot

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