adjust registered by to managed by on db aslo remove url and api key on adding sites for gm

backend/apps/farms/tests.py

@@ -11,12 +11,12 @@ from apps.sync.models import ActiveSite
 
 
 def _gm_visible_site(*, owner: User, site_name: str, code: str) -> Site:
-    """GM scope only sees sites linked to an ActiveSite they registered."""
+    """GM scope only sees sites linked to an ActiveSite they manage."""
     active_site = ActiveSite.objects.create(
         code=code,
         name=site_name,
         api_base_url=f"https://{code}.example/api/v1",
-        registered_by=owner,
+        managed_by=owner,
     )
     return Site.objects.create(
         site_name=site_name, user=owner, active_site=active_site