Modernize the notification manager tests
Review Request #3372 — Created Aug. 8, 2024 and submitted
This was mostly moving callback counters to guints and using g_assert_finalize_object.
Ran the tests under valgrind and called in the turtles for the rest.
| Summary | ID |
|---|---|
| 25d191f5c5a9b9e5e6e02d4de3766e166170339e |
