Return conflict when removing a referenced person

Deleting a profile still referenced elsewhere (for example as an
asset owner) surfaced an internal error. PostgreSQL reports ON DELETE
RESTRICT blocks as SQLSTATE 23001, not 23503; map both in profile
delete and propagate ErrProfileInUse through removeUser as CONFLICT.

Signed-off-by: Ludovic Vielle <ludovic@probo.com>

pkg/coredata/connector.go

@@ -323,7 +323,7 @@ WHERE %s AND id = @id
 	_, err := conn.Exec(ctx, q, args)
 	if err != nil {
 		if pgErr, ok := errors.AsType[*pgconn.PgError](err); ok {
-			if pgErr.Code == "23503" {
+			if pgErr.Code == "23503" || pgErr.Code == "23001" {
 				return ErrResourceInUse
 			}
 		}