Regression from PR #47458: Cannot install React Native from Git anymore

Description

This PR updates shouldSkipGenerationForRncore as such it checks if .../ReactCommon exists before deciding to skip rncore generation, whereas previously it would check .../ReactCommon/react/renderer/components/rncore specifically.

This change breaks installations from Git.

I noticed this while upgrading from 0.76.2 to 0.78.1.

Per my debugging:

• Previous behavior:
  • When installing from NPM: rncore is pre-generated using the prepack script
  • When installing from Git: rncore gets generated when running pod install
• Current behavior:
  • When installing from NPM: rncore is pre-generated using the prepack script
  • When installing from Git: rncore will NOT get generated when running pod install because .../ReactCommon is detected as exists even though .../ReactCommon/react/renderer/components/rncore does not

Steps to reproduce

npx @react-native-community/cli@latest init BuggyReactNative
cd ./BuggyReactNative/
npm install 'https://gitpkg.vercel.app/facebook/react-native/packages/react-native?0.78-stable'
cd ./ios/
bundle exec pod install
cd ..
ls ./node_modules/react-native/ReactCommon/react/renderer/components/rncore
# 💥 no such file or directory
# 💥 Xcode won't build the project

React Native Version

0.78.1

Affected Platforms

Runtime - iOS, Other (please specify)

Output of npx @react-native-community/cli info

Not relevant

Stacktrace or Logs

Not relevant

Reproducer

Run the reproducer bash script so you can test with your toolchain not mine

Screenshots and Videos

No response

从 packages/react-native/scripts/codegen/generate-artifacts-executor.js 中的 shouldSkipGenerationForRncore 开始，将所引用的早期行为与当前的 ReactCommon 检查进行比较。使用 issue 中的 Git 安装复现步骤和 bundle exec pod install 验证生成路径。安装后 rncore 目录存在且 iOS 项目可以构建，即表示完成。