KEP-4578: make the featuragate test more extensible.

[liangyuanpeng]

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

part of https://github.com/etcd-io/etcd/issues/18023

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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[k8s-ci-robot]

Hi @liangyuanpeng. 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.

Once the patch is verified, the new status will be reflected by the ok-to-test label.

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[codecov-commenter]

Codecov Report

:x: Patch coverage is 6.89655% with 27 lines in your changes missing coverage. Please review. :white_check_mark: Project coverage is 68.82%. Comparing base (93a245a) to head (c518fd3). :warning: Report is 2248 commits behind head on main.

:warning: Current head c518fd3 differs from pull request most recent head a2be729

Please upload reports for the commit a2be729 to get more accurate results.

Files with missing lines	Patch %	Lines
client/v3/kubernetes/client.go	0.00%	27 Missing :warning:

Additional details and impacted files

Files with missing lines	Coverage Δ
server/storage/mvcc/kvstore.go	89.76% <100.00%> (ø)
client/v3/kubernetes/client.go	0.00% <0.00%> (ø)

... and 21 files with indirect coverage changes

@@            Coverage Diff             @@
##             main   #18508      +/-   ##
==========================================
- Coverage   68.83%   68.82%   -0.01%     
==========================================
  Files         420      420              
  Lines       35489    35470      -19     
==========================================
- Hits        24429    24413      -16     
+ Misses       9639     9628      -11     
- Partials     1421     1429       +8     

---

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[k8s-ci-robot]

PR needs rebase.

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes-sigs/prow repository.

[stale[bot]]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed after 21 days if no further activity occurs. Thank you for your contributions.

[github-actions[bot]]

This pull request has been automatically marked as stale because it has not had recent activity. It will be closed after 21 days if no further activity occurs. Thank you for your contributions.

[github-actions[bot]]

This pull request has been automatically marked as stale because it has not had recent activity. It will be closed after 21 days if no further activity occurs. Thank you for your contributions.