[mob][photos] fix add to shared album for copied files

[AmanRajSinghMourya]

Description

Adding an already-uploaded photo from a shared album into another shared album fails when the acting user is a collaborator/admin but does not own the destination album.

The failure happens in apps/photos/lib/services/collections_service.dart:1987 because foreign-owned files go through _copyToCollection(...), and apps/photos/lib/services/collections_service.dart:2088 requires the destination collection to be
owned by the current user.

For foreign-owned files:

• if the destination album is owned by the current user, behavior stays the
  same and uses the old direct copy flow
• if the destination album is not owned by the current user but canAutoAdd(...) is allowed, the service now:
  1. copies those files into the user’s uncategorized album
  2. takes those newly user-owned copies and adds them to the destination album through the normal add flow