Don't report error to user if script parsing fails (#9104)

Author: elliette

packages/devtools_app/lib/src/screens/debugger/codeview_controller.dart

@@ -268,7 +268,6 @@ class CodeViewController extends DisposableController
         reportError(
           'Failed to parse ${scriptRef.uri}.',
           stack: StackTrace.current,
-          notifyUser: true,
         );
         return false;
       }

packages/devtools_app/test/screens/debugger/debugger_scripts_test.dart

@@ -217,25 +217,6 @@ void main() {
         ]);
       },
     );
-
-    testWidgetsWithWindowSize('an error message is shown', smallWindowSize, (
-      WidgetTester tester,
-    ) async {
-      await pumpDebuggerScreen(tester, mockDebuggerController);
-      // Dismiss any previous notifications:
-      notificationService.dismiss(
-        'Failed to parse package:gallery/src/unknown.dart.',
-      );
-      await tester.pumpAndSettle();
-
-      await showScript(mockEmptyScriptRef);
-      await tester.pumpAndSettle();
-
-      expect(
-        notificationService.activeMessages.first.text,
-        equals('Failed to parse package:gallery/src/unknown.dart.'),
-      );
-    });
   });
 }