chore: Remove unused project reference from data connector model (#804)

Author: eikek

components/renku_data_services/data_connectors/models.py

@@ -15,7 +15,6 @@
     ProjectPath,
 )
 from renku_data_services.namespace.models import GroupNamespace, ProjectNamespace, UserNamespace
-from renku_data_services.project.models import Project
 from renku_data_services.utils.etag import compute_etag_from_fields
 
 if TYPE_CHECKING:
@@ -55,7 +54,6 @@ class DataConnector(BaseDataConnector):
     id: ULID
     namespace: UserNamespace | GroupNamespace | ProjectNamespace
     updated_at: datetime
-    project: Project | None = None
 
     @property
     def etag(self) -> str: