Fix debugger panel test flake (#8146)

packages/devtools_app/integration_test/test/live_connection/debugger_panel_test.dart

diff --git a/packages/devtools_app/integration_test/test/live_connection/debugger_panel_test.dart b/packages/devtools_app/integration_test/test/live_connection/debugger_panel_test.dart
index b524563..cbd98f7 100644
--- a/packages/devtools_app/integration_test/test/live_connection/debugger_panel_test.dart
+++ b/packages/devtools_app/integration_test/test/live_connection/debugger_panel_test.dart
@@ -153,6 +153,12 @@
 
     logStatus('looking for the other_classes.dart file');
 
+    final otherClassesFinder = await retryUntilFound(
+      find.text('package:flutter_app/src/other_classes.dart'),
+      tester: tester,
+    );
+    expect(otherClassesFinder, findsOneWidget);
+
     expect(
       find.text('package:flutter_app/src/other_classes.dart'),
       findsOneWidget,