Avoid recomposing the QS scene every frame

This CL leverages derivedStateOf so that we don't recompose the QS scene
every time the current transition progress has changed. This should
improve the performance of any transition to the Shade or QS scenes.

Bug: 372412931
Test: Performed transitions to Shade and QS scene with Flexiglass on
 and recomposition counts shown in Studio.
Flag: com.android.systemui.scene_container
Change-Id: I0e321ab607214fe62fda5190f64773ef4210d8e9