Move linux-x64-flutter-gtk.zip to linux-x64-debug location. (#120658)

* Move linux-x64-flutter-gtk.zip to linux-x64-debug location.

linux-x64-flutter-gtk.zip is being uploaded twice to linux-x64-debug
and linux-x64 as part of making a soft transition to use linux-x64-debug
location. This PR starts using the copy inside linux-x64-debug to later
remove the duplicated upload.

* Also move arm64.

* Do not override output dir.

packages/flutter_tools/lib/src/flutter_cache.dart

@@ -314,7 +314,7 @@ class LinuxEngineArtifacts extends EngineCachedArtifact {
     if (_platform.isLinux || ignorePlatformFiltering) {
       final String arch = cache.getHostPlatformArchName();
       return <List<String>>[
-        <String>['linux-$arch', 'linux-$arch/linux-$arch-flutter-gtk.zip'],
+        <String>['linux-$arch', 'linux-$arch-debug/linux-$arch-flutter-gtk.zip'],
         <String>['linux-$arch-profile', 'linux-$arch-profile/linux-$arch-flutter-gtk.zip'],
         <String>['linux-$arch-release', 'linux-$arch-release/linux-$arch-flutter-gtk.zip'],
       ];

packages/flutter_tools/test/general.shard/cache_test.dart

@@ -668,7 +668,7 @@ void main() {
       );
 
       expect(artifacts.getBinaryDirs(), <List<String>>[
-        <String>['linux-x64', 'linux-x64/linux-x64-flutter-gtk.zip'],
+        <String>['linux-x64', 'linux-x64-debug/linux-x64-flutter-gtk.zip'],
         <String>['linux-x64-profile', 'linux-x64-profile/linux-x64-flutter-gtk.zip'],
         <String>['linux-x64-release', 'linux-x64-release/linux-x64-flutter-gtk.zip'],
       ]);
@@ -684,7 +684,7 @@ void main() {
       );
 
       expect(artifacts.getBinaryDirs(), <List<String>>[
-        <String>['linux-arm64', 'linux-arm64/linux-arm64-flutter-gtk.zip'],
+        <String>['linux-arm64', 'linux-arm64-debug/linux-arm64-flutter-gtk.zip'],
         <String>['linux-arm64-profile', 'linux-arm64-profile/linux-arm64-flutter-gtk.zip'],
         <String>['linux-arm64-release', 'linux-arm64-release/linux-arm64-flutter-gtk.zip'],
       ]);