windows: Fix `eslint` installation (#15331)

Close #13786. To make `eslint` running on Windows, I made the following
changes:

1. Ensure that `zed` downloads the `.zip` file.
2. Handle the `$shared` symbolic link by copying files to the link
location.
3. In #13891, I mentioned that the `npm` `post-install` script was
always failing. After debugging, I found it was due to missing
environment variables. This has been fixed, and I will submit a new PR
to address the changes in #13891.

With this PR, `eslint` can now successfully run on Windows. Video:



https://github.com/user-attachments/assets/e85451b8-0388-490a-8a75-01c12d744f7c



Release Notes:

- Fixed `eslint` not running on Windows
([#13786](https://github.com/zed-industries/zed/issues/13786)).

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Co-authored-by: Marshall Bowers <elliott.codes@gmail.com>