Fix getPackagesForUidInternal for known isolated compute apps to return owner package name

This is similar to handling done in `getNameForUid` and `getNameForUids` but was missed in the internal method leading to crashes when owner app is missing crossUser permissions.

Bug: 393946950
Change-Id: Ic5086aa55f4dd5c913196308ae1bca13d3f2f5c2
Flag: EXEMPT bugfix