eslint: Allow configuring `workingDirectory` (#22972)

This addresses this comment here:
https://github.com/zed-industries/zed/issues/9648#issuecomment-2579246865

Release Notes:

- Added ability to configure `workingDirectory` when using ESLint.
Example: `{"lsp": {"eslint": {"settings": {"workingDirectory": {"mode":
"auto" }}}}}`