Revert "Revert "Add unaudited exported flag to exposed runtime receivers""

This reverts commit 9041b19e.

Reason for revert: Failing tests have been resolved, reverting to
restore the other flagged receivers from the original CL.

This commit also marks the BubbleController's receiver as exported
since the ACTION_CLOSE_SYSTEM_DIALOGS broadcast can only be sent
by tests on T+ devices.

Bug: 234659204
Test: atest SystemUITests:com.android.systemui.statusbar.policy.SafetyControllerTest
Test: atest SystemUITests:com.android.systemui.wmshell.BubblesTest
Change-Id: Id6370750cab69d49e001f783051e4248201639e4