Move lifetime extension sysui notify into Runnable

Moves the call to System UI to alert it that a notification has been
lifetime extended due to cancelation into the
CancelNotificationRunnable, so that it shares the same lock event as the
cancel notification call. This should ensure the flag value is in sync,
avoiding hard to debug bugs.

Bug: 332568399
Test: atest NotificationManagerServiceTest, build+flash
Flag: ACONFIG android.app.lifetime_extension_refactor STAGING
Change-Id: I157ecaaf3ac6523519c814bcb1966e9a3b67e6b6