migrate experimental-compact-hash-check-enabled to feature gate.

[siyuanfoundation]

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

Part of #18023

[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

[codecov]

Codecov Report

Attention: Patch coverage is 90.47619% with 2 lines in your changes missing coverage. Please review.

Project coverage is 68.75%. Comparing base (b4450d5) to head (85363bd).
Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
server/embed/config.go	84.61%	1 Missing and 1 partial ⚠️

Additional details and impacted files

Files with missing lines	Coverage Δ
pkg/featuregate/feature_gate.go	87.66% <ø> (ø)
server/config/config.go	80.23% <ø> (ø)
server/embed/etcd.go	75.77% <100.00%> (-0.05%)	⬇️
server/etcdmain/config.go	67.76% <100.00%> (+1.09%)	⬆️
server/etcdserver/server.go	82.41% <100.00%> (-0.15%)	⬇️
server/features/etcd_features.go	60.00% <ø> (ø)
server/embed/config.go	79.46% <84.61%> (-0.03%)	⬇️

... and 22 files with indirect coverage changes

@@            Coverage Diff             @@
##             main   #19053      +/-   ##
==========================================
- Coverage   68.82%   68.75%   -0.07%     
==========================================
  Files         420      420              
  Lines       35627    35640      +13     
==========================================
- Hits        24520    24505      -15     
- Misses       9679     9702      +23     
- Partials     1428     1433       +5     

---

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[ahrtr]

Rebasing this PR should can resolve the failure in https://github.com/etcd-io/etcd/actions/runs/12358674375/job/34489749925?pr=19053

[ahrtr]

/retest

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: ahrtr, serathius, siyuanfoundation

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