Change usages of flags within bouncer to consider both compose bouncer and...

Change usages of flags within bouncer to consider both compose bouncer and scene container framework flags

Flag: ACONFIG com.android.systemui.compose_bouncer DEVELOPMENT
Bug: 310005730
Test: manually
 1. enable compose bouncer flag and static variable, interact with bouncer in legacy keyguard and notice it works as expected
 2. enable flexiglass, interact with bouncer and see it behaves normally.
Change-Id: I96b0fbecdcd1e6351c4f0f689e7989c4ca67eca1