fix rsync output utf8decode bug (#95881)

packages/flutter_tools/bin/xcode_backend.dart

@@ -190,6 +190,7 @@ class Context {
     runSync(
       'rsync',
       <String>[
+        '-8', // Avoid mangling filenames with encodings that do not match the current locale.
         '-av',
         '--delete',
         '--filter',

packages/flutter_tools/lib/src/base/os.dart

@@ -451,8 +451,9 @@ class _MacOSUtils extends _PosixUtils {
         );
         for (final FileSystemEntity unzippedFile in tempDirectory.listSync(followLinks: false)) {
           // rsync --delete the unzipped files so files removed from the archive are also removed from the target.
+          // Add the '-8' parameter to avoid mangling filenames with encodings that do not match the current locale.
           _processUtils.runSync(
-            <String>['rsync', '-av', '--delete', unzippedFile.path, targetDirectory.path],
+            <String>['rsync', '-8', '-av', '--delete', unzippedFile.path, targetDirectory.path],
             throwOnError: true,
             verboseExceptions: true,
           );

packages/flutter_tools/lib/src/ios/mac.dart

@@ -462,6 +462,7 @@ Future<XcodeBuildResult> buildXcodeProject({
         await globals.processUtils.run(
           <String>[
             'rsync',
+            '-8', // Avoid mangling filenames with encodings that do not match the current locale.
             '-av',
             '--delete',
             expectedOutputDirectory,

packages/flutter_tools/test/commands.shard/hermetic/build_ios_test.dart

@@ -84,6 +84,7 @@ void main() {
     return FakeCommand(
       command: const <String>[
         'rsync',
+        '-8',
         '-av',
         '--delete',
         'build/ios/Release-iphoneos/Runner.app',

packages/flutter_tools/test/general.shard/base/os_test.dart

@@ -586,6 +586,7 @@ void main() {
         ),
         FakeCommand(command: <String>[
           'rsync',
+          '-8',
           '-av',
           '--delete',
           tempDirectory.childDirectory('dirA').path,
@@ -593,6 +594,7 @@ void main() {
         ]),
         FakeCommand(command: <String>[
           'rsync',
+          '-8',
           '-av',
           '--delete',
           tempDirectory.childDirectory('dirB').path,

packages/flutter_tools/test/general.shard/ios/ios_device_start_nonprebuilt_test.dart

@@ -188,6 +188,7 @@ void main() {
       processManager.addCommand(const FakeCommand(command: kRunReleaseArgs));
       processManager.addCommand(const FakeCommand(command: <String>[
         'rsync',
+        '-8',
         '-av',
         '--delete',
         'build/ios/Release-iphoneos/My Super Awesome App.app',