Fix renames over language server for SSH remoting (#17897)

Release Notes:

- ssh remoting: Fix rename over language server

---------

Co-authored-by: Mikayla <mikayla@zed.dev>
Co-authored-by: Max <max@zed.dev>

crates/extension/src/extension_store_test.rs

@@ -609,7 +609,14 @@ async fn test_extension_store_with_test_extension(cx: &mut TestAppContext) {
         .await
         .unwrap();
 
-    let mut fake_servers = language_registry.fake_language_servers("Gleam".into());
+    let mut fake_servers = language_registry.register_fake_language_server(
+        LanguageServerName("gleam".into()),
+        lsp::ServerCapabilities {
+            completion_provider: Some(Default::default()),
+            ..Default::default()
+        },
+        None,
+    );
 
     let buffer = project
         .update(cx, |project, cx| {