fix(R-1187): the .fab import loads the database through the backup side (mariadb-admin/mariadb, the container's own credentials)

Found live on 9202: every MariaDB 11+ import timed out (mysqladmin/mysql absent). Red-proved.

controller/internal/appexport/r1187_abdfg_test.go

@@ -185,10 +185,8 @@ func TestR1187g_PostgisIsPostgresAndPsqlStopsOnError(t *testing.T) {
 			t.Errorf("%s is not classified as PostgreSQL: %+v", img, info)
 		}
 	}
-	args := strings.Join(psqlImportArgs("c", "u", "d"), " ")
-	if !strings.Contains(args, "--set=ON_ERROR_STOP=1") {
-		t.Fatalf("psql does not stop on error: %s", args)
-	}
+	// The load itself goes through appbackup.ImportDump (psql -v ON_ERROR_STOP=1 --single-transaction) since the
+	// import's own client calls were removed — TestR1187_TheImportLoadsTheDumpThroughTheBackupSide.
 }
 
 // (b), the security review's case: a link already in the destination folder (left by the old app, or made by an earlier