Fix BlobStoreRepositoryCleanupIT Leaking Futures (#69446) #69529
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The problem with #69434 was that during master failover
the listener might get retried after the new master has
already dropped the cleanup from the cluster state which
then conflicts with the cleanup executed by the repo consistency
checks after each test.
To prevent running into this conflict, just wait for the future
to actually return.
Closes #69434
backport of #69446