Properly setup global substream cursor based on manifest

Author: maxi297

airbyte_cdk/sources/declarative/parsers/model_to_component_factory.py

@@ -1439,7 +1439,7 @@ def create_concurrent_cursor_from_perpartition_cursor(
         stream_state = self.apply_stream_state_migrations(stream_state_migrations, stream_state)
 
         # Per-partition state doesn't make sense for GroupingPartitionRouter, so force the global state
-        use_global_cursor = isinstance(partition_router, GroupingPartitionRouter)
+        use_global_cursor = isinstance(partition_router, GroupingPartitionRouter)  or component_definition.get("global_substream_cursor", False)
 
         # Return the concurrent cursor and state converter
         return ConcurrentPerPartitionCursor(