[.NET] Disable output embedding on macOS, move it to the advanced options on other platforms.

platform/ios/export/export_plugin.cpp

@@ -135,6 +135,11 @@ void EditorExportPlatformIOS::_notification(int p_what) {
 }
 
 bool EditorExportPlatformIOS::get_export_option_visibility(const EditorExportPreset *p_preset, const String &p_option) const {
+	// Hide unsupported .NET embedding option.
+	if (p_option == "dotnet/embed_build_outputs") {
+		return false;
+	}
+
 	return true;
 }