add ignorable track-widget-creation flag to build and remove --track-widget-creation from xcode backend aot build aot (#31399)

packages/flutter_tools/bin/xcode_backend.sh

@@ -183,8 +183,7 @@ BuildApp() {
       --${build_mode}                                                       \
       --ios-arch="${archs}"                                                 \
       ${flutter_engine_flag}                                                \
-      ${local_engine_flag}                                                  \
-      ${track_widget_creation_flag}
+      ${local_engine_flag}
 
     if [[ $? -ne 0 ]]; then
       EchoError "Failed to build ${project_path}."

packages/flutter_tools/lib/src/commands/build_aot.dart

@@ -38,6 +38,12 @@ class BuildAotCommand extends BuildSubCommand with TargetPlatformBasedDevelopmen
         defaultsTo: false,
         help: 'Report timing information about build steps in machine readable form,',
       )
+      // track-widget-creation is exposed as a flag here but ignored to deal with build
+      // invalidation issues - there are no plans to support it for AOT mode.
+      ..addFlag('track-widget-creation',
+        defaultsTo: false,
+        hide: true,
+      )
       ..addMultiOption('ios-arch',
         splitCommas: true,
         defaultsTo: defaultIOSArchs.map<String>(getNameForIOSArch),