Gitignore RCTLegacyInteropComponents.mm as it is generated by Xcode (#41010)

Summary:
Pull Request resolved: https://github.com/facebook/react-native/pull/41010

## Changelog
[Internal] - Gitignore RCTLegacyInteropComponents.mm as it is generated by Xcode

Reviewed By: dmytrorykun

Differential Revision: D50323800

fbshipit-source-id: 63fdb82a97ff3c4d94d341555a0a3dcce8226a96

.gitignore

@@ -115,6 +115,7 @@ package-lock.json
 /packages/react-native/template/ios/Pods/
 /packages/react-native/template/ios/Podfile.lock
 /packages/rn-tester/Gemfile.lock
+/packages/**/RCTLegacyInteropComponents.mm
 
 # Ignore RNTester specific Pods, but keep the __offline_mirrors__ here.
 /packages/rn-tester/Pods/*

packages/react-native/scripts/codegen/generate-legacy-interop-components.js

@@ -35,8 +35,7 @@ const outputPath = argv.outputPath;
 
 function fileBody(components) {
   // eslint-disable duplicate-license-header
-  return `
-/*
+  return `/*
  * Copyright (c) Meta Platforms, Inc. and affiliates.
  *
  * This source code is licensed under the MIT license found in the