Keep few bouncer coroutines long running to allow dismissing lockscreen when...

Keep few bouncer coroutines long running to allow dismissing lockscreen when bouncer is not currently showing

Bug: 310005730
Test: Remain on the lockscreen after unlocking it with face without bypass
 Tap on a notification that will require bouncer to be shown.
 Lockscreen should get dismissed and the notification app should launch
Flag: com.android.systemui.compose_bouncer
Change-Id: I5a3662033f75cca4b4dfd8834dfc05c121517d62