[flutter_tools] fix Cannot delete file ENOENT from fuchsia_asset_builder (#119867)

* fix

* add test

Author: christopherfujino

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

@@ -116,7 +116,11 @@ class Config {
       if (managed) {
         rethrow;
       } else {
-        _file.deleteSync();
+        try {
+          _file.deleteSync();
+        } on FileSystemException {
+          // ignore
+        }
       }
     } on Exception catch (err) {
       _logger

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

@@ -130,6 +130,26 @@ void main() {
     expect(bufferLogger.errorText, contains(r'sudo chown -R $(whoami) /testfile'));
   });
 
+  testWithoutContext('Config.createForTesting does not error when failing to delete a file', () {
+    final BufferLogger bufferLogger = BufferLogger.test();
+
+    final FileExceptionHandler handler = FileExceptionHandler();
+    final MemoryFileSystem fs = MemoryFileSystem.test(opHandle: handler.opHandle);
+    final File file = fs.file('testfile')
+        // We write invalid JSON so that we test catching a `FormatException`
+        ..writeAsStringSync('{"This is not valid JSON"');
+    handler.addError(
+      file,
+      FileSystemOp.delete,
+      const FileSystemException(
+        "Cannot delete file, path = 'testfile' (OS Error: No such file or directory, errno = 2)",
+      ),
+    );
+
+    // Should not throw a FileSystemException
+    Config.createForTesting(file, bufferLogger);
+  });
+
   testWithoutContext('Config in home dir is used if it exists', () {
     memoryFileSystem.file('.flutter_example').writeAsStringSync('{"hello":"bar"}');
     config = Config(