Hide limited users if viewed by anonymous ghost (#25214) (#25224)

Backport #25214 by @KN4CK3R

The ghost user leads to inclusion of limited users/orgs in
`BuildCanSeeUserCondition`.

Co-authored-by: KN4CK3R <admin@oldschoolhack.me>
(cherry picked from commit a9ebf911fa)

models/packages/container/search.go

@@ -271,6 +271,10 @@ func GetRepositories(ctx context.Context, actor *user_model.User, n int, last st
 		cond = cond.And(builder.Gt{"package_property.value": strings.ToLower(last)})
 	}
 
+	if actor.IsGhost() {
+		actor = nil
+	}
+
 	cond = cond.And(user_model.BuildCanSeeUserCondition(actor))
 
 	sess := db.GetEngine(ctx).