Move interface AlarmBackend from server/etcdserver/api/v3alarm to server/storage/schema to fix the unexported-return lint error

[aladesawe]

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

[k8s-ci-robot]

Hi @aladesawe. 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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[aladesawe]

Pulled from PR

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 68.86%. Comparing base (eb7607b) to head (6f27da2).
Report is 4 commits behind head on main.

Additional details and impacted files

Files with missing lines	Coverage Δ
server/etcdserver/api/v3alarm/alarms.go	84.21% <100.00%> (ø)
server/storage/schema/alarm.go	86.66% <100.00%> (ø)

... and 18 files with indirect coverage changes

@@            Coverage Diff             @@
##             main   #19342      +/-   ##
==========================================
- Coverage   68.89%   68.86%   -0.03%     
==========================================
  Files         420      420              
  Lines       35753    35753              
==========================================
- Hits        24632    24622      -10     
- Misses       9698     9711      +13     
+ Partials     1423     1420       -3     

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[ahrtr]

/ok-to-test

[ahrtr]

/test pull-etcd-integration-1-cpu-amd64

[ahrtr]

cc @fuweid @ivanvc @jmhbnz @serathius

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: ahrtr, aladesawe, fuweid

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[aladesawe]

@ahrtr Do we need to backport this into v3.6?

[ahrtr]

@ahrtr Do we need to backport this into v3.6?

It's YES If this PR was merged after we cut branch release-3.6 but before we release 3.6.0-rc.0.

But we have already released the 3.6.0-rc.0 version, so in generally, no backport. But I don't very strong opinion on that. But definitely no backport after we release 3.6.0-rc.1