This is a sequence of changes to move macOS files to *.macos.js files, hopefully without losing history and to show that we're not making explicit changes to macOS files. It will use a diamond pattern, where any file that was forked for macOS will be moved from it's source file first and merged with a commit that moves a file back to it's original file location. Here are the steps:

1. Move all forked JS files to *.macos.js
2. Merge in a branch that moves the forked files to *.native.js files and then back to their original file

We cannot convince git history to treat an overwrite of Image.macos.js with Image.ios.js unless the file is deleted first.

In order to preserve history of Image.ios.js, we move the file to Image.macos.js, rather than just overwriting it in the first place.

We can retain the same history for both the original and the copied file if we copy it twice and merge the commits. This copies the files to a different location to copy them back.

Since the iOS code no longer has macOS specific logic in it, this is the result of running `yarn test-ci -u`.

Additionally, because `@react-native/virtualized-lists` is not part of the react-native-macos monorepo, this change adds a line to jest.config.js to re-map imports to `@react-native-mac/virtualized-lists`.