[release-3.6] Fix unsynchronized range over leaseCache.entries

[k8s-infra-cherrypick-robot]

This is an automated cherry-pick of #22129

/assign ahrtr

[kubernetes-prow]

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[kubernetes-prow]

@k8s-infra-cherrypick-robot: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
pull-etcd-coverage-report	d2013b6	link	true	/test pull-etcd-coverage-report

Full PR test history. Your PR dashboard. Please help us cut down on flakes by linking to an open issue when you hit one in your PR.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 69.65%. Comparing base (5f12ec3) to head (d2013b6).

Additional details and impacted files

Files with missing lines	Coverage Δ
client/v3/leasing/cache.go	91.47% <100.00%> (+4.25%)	⬆️

... and 45 files with indirect coverage changes

@@               Coverage Diff               @@
##           release-3.6   #22150      +/-   ##
===============================================
+ Coverage        68.78%   69.65%   +0.87%     
===============================================
  Files              420      405      -15     
  Lines            35890    35444     -446     
===============================================
+ Hits             24686    24688       +2     
+ Misses            9752     9322     -430     
+ Partials          1452     1434      -18     

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[kubernetes-prow]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: ahrtr, k8s-infra-cherrypick-robot

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