[HUNs] skip cancelling huns when guts are exposed

HeadsUpManager cancels auto removal callback when guts are exposed for HUNs to keep them pinned. However NSSLController remove HUNs  for all non dismissable notifications onChildSnappedback.
This HUN dismissal behavior does not match with the expected behavior by HeadsUpManager. This CL skips immediate HUN removal when GUTs are exposed.

Bug: 372227464
Flag: com.android.systemui.skip_hide_sensitive_notif_animation
Test: Presubmit && see after video.
Change-Id: Ie0ed6d03c9d645ca5606c70312a36c20318193b5