QS skip squishing during lookahead or when squishiness is 1.0

Why?
QS skips squishing when performing lookaheads to ensure accurate
pre-layout sizing, or when the squishiness is set to 1.0 to avoid
unnecessary calculations.

Test: Manually tested on Flexiglass ON and Flexiglass OFF
Bug: 410524175
Flag: com.android.systemui.scene_container
Change-Id: I89ce6f0002e0cd2e0ce0dbf1f699c62f8292c8e8