Deprecate startExpandLatencyTracking

Puts the only call to startExpandLatencyTracking behind the Scene
Container flag and marks it as deprecated. This needs to be
reimplemented in a different way for Flexiglass.

Flag: ACONFIG com.android.systemui.scene_container DEVELOPMENT
Test: Updated and ran affected test
Bug: 303267342
Bug: 329863123
Change-Id: I16e3522a655023f8352211020374b6d1cfa3d421