fix(test) reduce queue persistence test time from 60 secs to 6 secs (#21142)

This PR reduces the time to run `queue persistence with inflight
messages` test from 60 seconds down to about 6 seconds.

The test simulates a crash to ensure that inflight messages are cleaned
up and re-queued when the new process starts. Since messages are
considered dead after 5 seconds of being queued, reopening the db within
5 seconds does not re-queue the messages on startup (they do get
re-queued after 60 seconds, which is the cleanup frequency). By waiting
for 5 seconds before reopening the db, the test ensures that the cleanup
happens quickly when the db is opened.

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