Limit the number of shortcuts per app that can be retained by system

This is a second attempt at fixing the issue, the previous CL
ag/20642213 was reverted because it simply throws an exception when the
limit is reached, which causes apps to crash since chat apps tends to be
sending large amount of conversation shortcuts and they have no way to
know how many of these shortcuts are still cached by the system.

Instead of throwing an exception, this CL simply removes excessive
shortcuts to avoid crashes. Currently there is a limit on the number
of shortcuts an app can publish in respect to each launcher activity.
This CL further implements a global maximum of total number of shortcuts
that can be retained for an app to mitigate from any potential system
health issue.

When the global maximum is reached, ShortcutService will proactively
removes shortcuts from system memory. Cached shortcuts are removed
first, followed by dynamic shortcuts, using last updated time as
tie-breaker.

This CL additionally addresses an unexpected flow where re-publishing
previously removed shortcuts that are still retained by the system could
cause the total number of shortcuts to exceed previously set limit.

Bug: 250576066 233155034
Test: manual
Change-Id: I001c7a87b62aefa9487bf8efaf3cd02d7cb21521
Merged-In: I001c7a87b62aefa9487bf8efaf3cd02d7cb21521