Revert^2 "Flag off all edges leading KTF out of the Lockscreen scene"

This CL flags off all edges to states that are not part of the
Lockscreen scene in Flexiglass. We will introduce a new state and
corresponding edges representing the "outside" states in a later CL.

Revert submission 27303196-revert-27057737-VHSLSLTGYG

Reason for revert: revert^2 with fixed tests

Reverted changes: /q/submissionid:27303196-revert-27057737-VHSLSLTGYG

Test: Manual and unit tests of the follow up CLs
Bug: b/330311871
Bug: b/336576536
Flag: ACONFIG com.android.systemui.scene_container DEVELOPMENT
Change-Id: Ib501f82017a946c29852ee560763a6de17a7c8df