Simplify how we compute strings for uninstalling from profiles and other users

This removed redundancy in code and makes it easier to understand how
string resources are selected for different uninstall scenarios

Bug: 274120822
Test: Follow Pia Manual Test Plan
Flag: android.content.pm.use_pia_v2
Change-Id: I923c868b57fa9a417759cf756c224d94c3887d38