Car user switching dialog taking more than 3 seconds

Bug: 144706096
Bug: 145021634
Bug: 140999054
Bug: 145001354
Test: adb shell am instrument -w -r -e include_creation_time true -e iterations 10 -e class android.platform.test.scenario.multiuser.nonui.TEST_NAME android.platform.test.scenario/androidx.test.runner.AndroidJUnitRunner
      // for TEST_NAME SwitchToExistingSecondaryUserBenchmark, user switch time dropped from 5.2 seconds to 2.2 seconds
Change-Id: I5474c683725b22f3e15e9b80ac4209df028a7993
(cherry picked from commit dec438aa5c5ae5a54d7bc7ac788ec4936ae3e3ba)