Make KeyguardBlueprint flow a state flow

To simplify the flow, make keyguardblueprint a stateflow and use a
shared flow in order to propagate a refresh.

Bug: 308957334
Test: change orientation on tablet device. Switch between blueprints
using adb.
Flag: NONE

Change-Id: I379bd80aa71313a6af9061bd9c2b9073bb3aae20