[WIP] rewrite coverage test execution

[ivanvc]

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

[k8s-ci-robot]

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[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: ivanvc

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[ivanvc]

/test pull-etcd-coverage-report

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 67.90%. Comparing base (566a42c) to head (db6be2f).
⚠️ Report is 17 commits behind head on main.

Additional details and impacted files

see 282 files with indirect coverage changes

@@            Coverage Diff             @@
##             main   #21145      +/-   ##
==========================================
- Coverage   68.33%   67.90%   -0.43%     
==========================================
  Files         429      449      +20     
  Lines       35242    37839    +2597     
==========================================
+ Hits        24081    25694    +1613     
- Misses       9764    10729     +965     
- Partials     1397     1416      +19     

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