github/workflows: remove coverage workflow

[ivanvc]

This workflow has already been migrated to the Prow infrastructure.

To have the Codecov bot publish the coverage report from the given pull request, it must be invoked using some additional arguments.

Please read https://github.com/etcd-io/etcd/blob/main/CONTRIBUTING.md#contribution-flow.

[k8s-ci-robot]

Skipping CI for Draft Pull Request.
If you want CI signal for your change, please convert it to an actual PR.
You can still manually trigger a test run with /test all

[ivanvc]

/test all

[ivanvc]

/test pull-etcd-coverage-report

[ivanvc]

/test pull-etcd-coverage-report

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 68.84%. Comparing base (14cf669) to head (1651346).

❗ Current head 1651346 differs from pull request most recent head 5bb5f28

Please upload reports for the commit 5bb5f28 to get more accurate results.

Additional details and impacted files

see 31 files with indirect coverage changes

@@            Coverage Diff             @@
##             main   #19424      +/-   ##
==========================================
- Coverage   68.95%   68.84%   -0.12%     
==========================================
  Files         420      420              
  Lines       35753    35727      -26     
==========================================
- Hits        24655    24595      -60     
- Misses       9677     9703      +26     
- Partials     1421     1429       +8     

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[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: ivanvc
Once this PR has been reviewed and has the lgtm label, please assign serathius for approval. For more information see the Code Review Process.

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