Test Native Watchdog triggers RollbackManager rollback

Test flow:
    * Staged install com.google.android.modulemetadata
    * Crash a native process (apexd) enough times to trigger a rollback
    * Wait for device reboot (automatically)
    * Assert rollback of com.google.android.modulemetadata has been
    committed

Test: atest StagedRollbackTest#testNativeWatchdogTriggersRollback
Bug: 135864628
Change-Id: Ibe726c140939190adb3db9c18b3b442ba59548a3