During app install in PS, promise app icons and the
installed app icons are added automatically on home screen.
In this change we restrict the same.
Also, checked that enabling `PROMISE_APP_IN_ALL_APPS` still
works for PS apps after this change.
Bug: 325057835
Test: Launcher3 tests
Flag: ACONFIG com.android.launcher3.Flags.private_space_restrict_item_drag TEAMFOOD
Change-Id: Iecff850bcc1cd17a123553a4258943da1ee61fcc