language servers: Fix wrong language server name (#20428)

This fixes the issue of multiple language servers showing up as `node`
in the language server logs dropdown.

It does this by changing `language_server.name()` to return the
adapter's name, not the binary name, and changing types to make sure
that we always use this.

Release Notes:

- Fixed language server names showing up only as `"node"`

---------

Co-authored-by: Sam Rose <hello@samwho.dev>
Co-authored-by: Bennet <bennet@zed.dev>

crates/languages/src/rust.rs

@@ -6,7 +6,7 @@ use futures::{io::BufReader, StreamExt};
 use gpui::{AppContext, AsyncAppContext};
 use http_client::github::{latest_github_release, GitHubLspBinaryVersion};
 pub use language::*;
-use lsp::LanguageServerBinary;
+use lsp::{LanguageServerBinary, LanguageServerName};
 use regex::Regex;
 use smol::fs::{self, File};
 use std::{