032: fix async get_dataset_linked_dashboard_count passed to asyncio.to_thread

get_dataset_linked_dashboard_count is async (coroutine function), but was
passed to asyncio.to_thread() which expects a sync callable. This returned
a coroutine object instead of an int, causing:
  '>' not supported between instances of 'coroutine' and 'int'

Fix: await the async method directly inside asyncio.wait_for().

backend/src/services/resource_service.py

@@ -312,9 +312,7 @@ class ResourceService:
                 async with sem:
                     try:
                         return await asyncio.wait_for(
-                            asyncio.to_thread(
-                                client.get_dataset_linked_dashboard_count, ds_id
-                            ),
+                            client.get_dataset_linked_dashboard_count(ds_id),
                             timeout=10.0,
                         )
                     except (TimeoutError, Exception):