fix: Handle truncated unique_key in list_head by fetching full request data

Closes: #627

Author: vdusek

src/apify/storage_clients/_apify/_request_queue_single_client.py

@@ -236,6 +236,14 @@ async def _list_head(self) -> None:
 
         # Update the cached data
         for request_data in response.get('items', []):
+            # Due to https://github.com/apify/apify-core/blob/v0.1377.0/src/api/src/lib/request_queues/request_queue.ts#L53,
+            # the list_head endpoint may return truncated fields for long requests (e.g., long URLs or unique keys).
+            # If truncation is detected, fetch the full request data by its ID from the API.
+            # This is a temporary workaround - the caching will be refactored to use request IDs instead of unique keys.
+            # See https://github.com/apify/apify-sdk-python/issues/630 for details.
+            if '[truncated]' in request_data['uniqueKey'] or '[truncated]' in request_data['url']:
+                request_data = await self._api_client.get_request(request_id=request_data['id'])  # noqa: PLW2901
+
             request = Request.model_validate(request_data)
 
             if request.unique_key in self._requests_in_progress: