Ensure the data is reset between lookups

The listener adds updates to a list this change adds
a couple of reset data between any lookups to the
listener for bubble tests.

A couple of tests check that an update doesn't happen,
in those add a delay so there's a chance for it to
happen and verify it didn't.

Test: atest NotificationManagerTest
Bug: 204260661
Change-Id: I46ba5be198f427b7e1bd677a03fcd37c213d4308