[Do Not Merge] Revert "Implement a global maximum on number of shortcuts an app can publish"

This reverts commit 7622d6da.

Reason for revert: bugs related to conversation shortcuts can lead to system retaining shortcuts exceeding this number, causing crashes in chat apps such as whatsapp, messages ... e.t.c

Change-Id: I1d7c265160389e45cf57a4bf8ce756376068d5b7