Ensure each dot contains only relevant notification to the shortcut

and displays system shortcut when long click on deep shortcut.

In this CR we
1) for each shortcut, we filters the notifications to ensure we only
 get notifications with identical shortcutId.
2) allow system shortcut to be displayed when user long click on a
DeepShortcut

Bug: 132336512
Change-Id: Idc9eaed55e900ed4027a43ee9c3fd7dc6f4480b2