migrate experimental-downgrade-checktime to downgrade-checktime

[ajaysundark]

Migrate flag experimental-downgrade-check-time to downgrade-check-time.

Sub task from #19141

[k8s-ci-robot]

Hi @ajaysundark. 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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[ajaysundark]

/cc @siyuanfoundation @gangli113

[k8s-ci-robot]

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 68.91%. Comparing base (e13196b) to head (80a8a82).
Report is 23 commits behind head on main.

Additional details and impacted files

Files with missing lines	Coverage Δ
server/embed/config.go	79.75% <100.00%> (+0.03%)	⬆️
server/embed/etcd.go	76.45% <100.00%> (-0.35%)	⬇️
server/etcdmain/config.go	73.80% <100.00%> (+0.31%)	⬆️

... and 27 files with indirect coverage changes

@@            Coverage Diff             @@
##             main   #19328      +/-   ##
==========================================
+ Coverage   68.88%   68.91%   +0.02%     
==========================================
  Files         420      420              
  Lines       35706    35720      +14     
==========================================
+ Hits        24596    24616      +20     
+ Misses       9687     9675      -12     
- Partials     1423     1429       +6     

---

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[siyuanfoundation]

/ok-to-test

[siyuanfoundation]

/retest

[siyuanfoundation]

/lgtm
Thanks @ajaysundark for your first PR!

[k8s-ci-robot]

New changes are detected. LGTM label has been removed.

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

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

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