Linux "flutter/generated_plugin_registrant.{h,cc}" are checked into source control, building generates "// clang-format off" #76726
Description
I vaguely remember having a conversation with @stuartmorgan about why this file isn't in the ephemeral directory but I can't recall the details.
Either it should be generated in the ephemeral directory so it's not checked into source control, or if it is supposed to be checked into source control, all the generated_plugin_registrant files checked in the Flutter repo should be updated to have // clang-format off so we don't get a dirty working copy every time we build an example or integration test app.
#76662
diff --git a/dev/integration_tests/flutter_gallery/linux/flutter/generated_plugin_registrant.cc b/dev/integration_tests/flutter_gallery/linux/flutter/generated_plugin_registrant.cc
index 026851fa2f..f6f23bfe97 100644
--- a/dev/integration_tests/flutter_gallery/linux/flutter/generated_plugin_registrant.cc
+++ b/dev/integration_tests/flutter_gallery/linux/flutter/generated_plugin_registrant.cc
@@ -2,6 +2,8 @@
// Generated file. Do not edit.
//
+// clang-format off
+
#include "generated_plugin_registrant.h"
#include <url_launcher_linux/url_launcher_plugin.h>