test: fix flaky test case test_replica_rebuild_per_volume_limit
#1789
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Which issue(s) this PR fixes:
longhorn/longhorn#8011
What this PR does / why we need it:
https://github.com/longhorn/longhorn-tests/blob/master/manager/integration/tests/test_scheduling.py#L443C8-L443C51
Add
wait_for_volume_healthy
before deleting replicas to wait for volume rebuilding to complete, and avoid the errorfailed to remove replica: no other healthy replica available
.Special notes for your reviewer:
Additional documentation or context
https://ci.longhorn.io/job/private/job/longhorn-tests-regression/6439/consoleText
jenkins test result:
https://ci.longhorn.io/job/private/job/longhorn-tests-regression/6442/