Set the target state during lookahead pass

This CL makes sure that we set the target state of each element during
the lookahead pass rather than during the approach pass. This ensures
that the target state of all elements is set before starting the
approach pass, making some transformations with anchors work
independently of the order of elements in the UI hierarchy.

Bug: 290930950
Test: atest AnchoredTranslateTest
Flag: com.android.systemui.scene_container
Change-Id: I591dac9b30c4a27e0f1f8500f04a7008cf912590