Fix tests to use updated API

Rename the hidden APIs in PackageHealthObserver to match module APIs.
Remove flags which require DEPRECATE_FLAGS_AND_SETTINGS_RESETS disabled.

Bug: 289203818
Test: verified by running tests locally.
Flag: EXEMPT Test change
Change-Id: I8afb5dd7f82c010cbb685029b55155bff32c6305
8 files changed