Store pulled diagnostics' result_ids more persistently (#32403)

Follow-up of https://github.com/zed-industries/zed/pull/19230

`BufferId` can change between file reopens: e.g. open the buffer, close
it, go back in history to reopen it — the 2nd one will have a different
`BufferId`, but the same `result_ids` semantically.

Release Notes:

- N/A

crates/editor/src/editor_tests.rs

@@ -21941,7 +21941,7 @@ async fn test_pulling_diagnostics(cx: &mut TestAppContext) {
                 .expect("created a singleton buffer")
                 .read(cx)
                 .remote_id();
-            let buffer_result_id = project.lsp_store().read(cx).result_id(buffer_id);
+            let buffer_result_id = project.lsp_store().read(cx).result_id(buffer_id, cx);
             assert_eq!(expected, buffer_result_id);
         });
     };