Downloading files and folders should preserve executable bit #112099

Describe the bug
When you download a file from a remote (e.g. Codespaces), attributes such as the executable bit are removed. This is a (somewhat minor) annoyance when you are downloading files such as compiled binaries.

To Reproduce
Steps to reproduce the behavior with Codespaces:

1. Within a codespace, create a file that has the executable bit set (e.g. touch foo && chmod +x foo).
2. CMD+Click on the file and download it to your laptop
3. The file will not have the executable bit locally so you need to run chmod +x foo again

Expected behavior
The executable bit should be preserved when downloading files.

https://github.com/microsoft/vssaas-planning/issues/1639