Revert^2 "Add hideCurrentOverlays to UserActionResult.ShowOverlay()"

This reverts commit f54b4665.

Reason for revert: build issue fixed in this reland

Bug: 389618797
Test: atest OverlayTest
Test: atest PredictiveBackHandlerTest
Flag: com.android.systemui.scene_container
Change-Id: Idea3df6d7dc71f0465e7b73393f97c6a1a103b4d