@CanBeALL annotation for PackageManager

Add the @CanBeALL annotation to various PackageManager-related methods
that accept UserHandle.USER_ALL. A few of the places they call into are
likewise annotated. This can help clarify which methods accept pseuduser
values.

There is no guarantee that this accounts for all such usages.

Test: N/A just annotations
Bug: 373455030
Flag: EXEMPT documentation only
Change-Id: I1f81478ed6103880e812483ada24a33ff4362ec6