Fork UserLifecycleTests to make tests realistic

This commit creates forks of the UserLifecycleTests, more specifically
of the userSwitch tests.
The main change is that we avoid creating a new user at each iteration
(to reduce post user creation device buzyness) and increase the wait
period between user switches.

Bug: 261621873
Test: atest UserLifecycleTests
Change-Id: Iad57848cc313b07275df2927be2feb882a10f2ba