remove flutter_app

Author: goderbauer

pkgs/objective_c/example/flutter_app/pubspec.yaml

@@ -3,8 +3,6 @@ description: "A new Flutter project."
 publish_to: 'none'
 version: 0.1.0
 
-resolution: workspace
-
 environment:
   sdk: ^3.10.0
 

pubspec.yaml

@@ -104,7 +104,7 @@ workspace:
   - pkgs/native_toolchain_c
   - pkgs/objective_c
   - pkgs/objective_c/example/command_line
-  - pkgs/objective_c/example/flutter_app
+  # - pkgs/objective_c/example/flutter_app # Requires Flutter.
   - pkgs/pub_formats
   - pkgs/record_use
   - pkgs/record_use/test_data/drop_data_asset