Prevent restored display tasks from showing on keyguard.

No-ops restoreDisplay events that occur when keyguard is present. To
ensure the display is eventually restored, adds DesktopTasksController
as a KeyguardChangeListener to perform needed display restorations when
keyguard is removed.

Bug: 433640030
Test: Manual
Flag: com.android.window.flags.enable_display_reconnect_interaction
Change-Id: I5eb80a0a0b03d30db26ffbf17660458baaa8de25