Take a reference in LSP notify (#23077)

In current code this doesn't have benefit. In preparation for avoiding a
clone of workspace configuration. Having the interface this way may make
opportunities for efficiency clearer in the future

Release Notes:

- N/A

crates/editor/src/test/editor_lsp_test_context.rs

@@ -331,7 +331,7 @@ impl EditorLspTestContext {
     }
 
     pub fn notify<T: notification::Notification>(&self, params: T::Params) {
-        self.lsp.notify::<T>(params);
+        self.lsp.notify::<T>(&params);
     }
 
     #[cfg(target_os = "windows")]