Revert back to waiting 10s to cool down

After the tests ran for a couple of weeks, no significant changes were
detected. However, some tests started to crash more often. Since we are
not sure if it is due to the testing platform or due to the change in
wait time, we are reverting to the amount used on the original
investigation.

Bug: 261621873
Test: atest UserLifecycleTests
Change-Id: I0bf137503f153993d7067c71b4e6f303e58031a7