Do not show snooze button for cancelled notifications

 Cancelled notifications should not be snoozable.

Test: 1) receive a message (from an app that cancels on send, e.g. Gmail Chat)
2) Inline reply to the message
3) Snooze button is not visible

Test: atest PreparationCoordinatorTest

Bug: 237288843
Change-Id: Ib1712cf55bb8f7914f2f340b73edafdae015f656