Handle keyboard/adb keyevent based authentication confirmation for password bouncer

Bug: 310005730
Test: verified manually and through e2e tests
 1. Enable password bouncer
 2. Send a test messaging notification with inline reply option
 3. Lock the device
 4. Go to lockscreen, expand the notification shade, tap reply on the
    notificaiton
 5. password bouncer shows up
 6. enter the password and use `adb shell input keyevent ENTER` for sending the
    confirmation key
 7. Password bouncer dismisses as expected and focus returns to the
    inline reply text box in the notification, instead of showing a
black empty screen
Flag: com.android.systemui.compose_bouncer
Change-Id: I25538d204cc7a56c9566b7fbded1c7013bd28d10

Change-Id: Ifaaebed061205f40139f86816081b3c61f7d3c7e