Closes#34325
**Background**
When upgrading/reinstalling the ESLint language server, extracting the
archive over an existing version directory that contains symlinks can
fail and interrupt the installation.
```
failed to unpack .../vscode-eslint-2.4.4/.../client/src/shared
File exists (os error 17) when symlinking ../../$shared/ to .../client/src/shared
```
**Root cause**
Extracting into a non-empty directory conflicts with leftover
files/symlinks (e.g., `client/src/shared -> ../../$shared`), causing
“File exists (os error 17)”.
When `fs::metadata(&server_path).await.is_err()` is true, the code falls
back to cached_server_binary, but that still targets the same
(potentially corrupted/half-installed) directory and does not run `npm
install` or `npm run compile`, so the system cannot recover and remains
broken.
**Change**
Before downloading and extracting, delete the target version directory
(vscode-eslint-<version>) to ensure an empty extraction destination and
avoid conflicts.
**Alternative approaches**
temp directory + rename: extract into a clean temp directory and rename
into place to avoid half-installed states
[async-tar](https://github.com/dignifiedquire/async-tar) enhancement:
tolerate already-existing symlinks (or add a “replace-existing” option).
Release Notes:
- Fixed eslint installation not clearing files after previous attempts'
176c445817