Handle the clear all button in the refactored stack.

Test: atest FooterViewTest ActiveNotificationsInteractorTest FooterViewModelTest
Bug: 293167744
Flag: ACONFIG com.android.systemui.notifications_footer_view_refactor DEVELOPMENT

Change-Id: I7bd06b36c1774c56fb404d68bcd3db28a0d8dc5b
16 files changed