tests: deflakey TestLeaseGrantKeepAliveOnce

[tcchawla]

Following change deflakes the test here #19500 which can be reproduced by TESTCASE=TestLeaseGrantKeepAliveOnce make test-e2e. This change just increases the timeout and checks if the leader has changed.

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

[k8s-ci-robot]

Hi @tcchawla. 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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[tcchawla]

cc @ahrtr

[ahrtr]

please squash the commits, thx

[tcchawla]

Squashed all the commits on this branch

cc @ahrtr

[ahrtr]

/ok-to-test

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 68.85%. Comparing base (3a2cece) to head (3e43e45).
Report is 2 commits behind head on main.

Additional details and impacted files

see 24 files with indirect coverage changes

@@            Coverage Diff             @@
##             main   #19504      +/-   ##
==========================================
+ Coverage   68.81%   68.85%   +0.03%     
==========================================
  Files         421      421              
  Lines       35901    35901              
==========================================
+ Hits        24706    24720      +14     
+ Misses       9769     9754      -15     
- Partials     1426     1427       +1     

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[ahrtr]

LGTM

Thanks

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

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

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[ahrtr]

/cherry-pick release-3.6

[k8s-infra-cherrypick-robot]

@ahrtr: new pull request created: #19507

In response to this:

/cherry-pick release-3.6

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