Dev Containers doubles the size of gitconfig when using shared HOME folder

[yyashar]

• VSCode Version: 1.96.0
• Local OS Version: 1.96.0
• Remote OS Version: rhel 8.6

Steps to Reproduce:

1. Configure shared HOME folder with the following setting: "remoteEnv": { "HOME": "" }
2. Use vscode to connect to the container, or reload vscode window
3. Check the size of .gitconfig in the shared folder ($HOME/.gitconfig), it should double its previous size

It's possible to avoid it by setting "dev.containers.copyGitConfig" to false.
However, if the destination .gitconfig file is the same as the source, dev container should not copy it.