emmet: Use index.js directly to launch language server (#36126)

This PR updates the Emmet extension to use the `index.js` file directly
to launch the language server.

This provides better cross-platform support, as we're not relying on
platform-specific `.bin` wrappers.

Release Notes:

- N/A

extensions/emmet/src/emmet.rs

@@ -5,7 +5,7 @@ struct EmmetExtension {
     did_find_server: bool,
 }
 
-const SERVER_PATH: &str = "node_modules/.bin/emmet-language-server";
+const SERVER_PATH: &str = "node_modules/@olrtg/emmet-language-server/dist/index.js";
 const PACKAGE_NAME: &str = "@olrtg/emmet-language-server";
 
 impl EmmetExtension {