Move Flutter.framework to build directory instead of ios/Flutter (#70224)

diff --git a/packages/flutter_tools/lib/src/project.dart b/packages/flutter_tools/lib/src/project.dart
index f32a77a..9e36c46 100644
--- a/packages/flutter_tools/lib/src/project.dart
+++ b/packages/flutter_tools/lib/src/project.dart
@@ -689,6 +689,13 @@
       .childDirectory('Flutter')
       .childDirectory('App.framework');
 
+  /// No longer copied to this location.
+  ///
+  /// Used only for "flutter clean" to remove old references.
+  Directory get deprecatedProjectFlutterFramework => _flutterLibRoot
+      .childDirectory('Flutter')
+      .childDirectory('Flutter.framework');
+
   Directory get pluginRegistrantHost {
     return isModule
         ? _flutterLibRoot