tests: deflake TestCompactionHash

[Aijeyomah]

Fixes #21980

• Made TestCompactionHash wait for compaction to finish before continuing, removing the timing-related flake.

Testing:

go test -race ./tests/integration/clientv3 \
  -run '^TestCompactionHash$' \
  -count=10 \
  -cpu=4 \
  -failfast \
  -timeout=30m

Test Result

[kubernetes-prow]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: Aijeyomah
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[kubernetes-prow]

Hi @Aijeyomah. 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.

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