🚨(backend) fix Django deprecation warning in RecordingFactory

Addressed a `DeprecationWarning` in `RecordingFactory` related to the
`_after_postgeneration` method, which will stop saving the instance after
postgeneration hooks in the next major release. To resolve this,
`skip_postgeneration_save=True` was added to `RecordingFactory.Meta` to
avoid extraneous save calls. Alternatively, if instance saving is needed,
the save call can be moved to postgeneration hooks or by overriding
`after_postgeneration`.

src/backend/core/factories.py

@@ -32,6 +32,7 @@ class ResourceFactory(factory.django.DjangoModelFactory):
 
     class Meta:
         model = models.Resource
+        skip_postgeneration_save = True
 
     is_public = factory.Faker("boolean", chance_of_getting_true=50)
 
@@ -45,6 +46,8 @@ class ResourceFactory(factory.django.DjangoModelFactory):
                 else:
                     UserResourceAccessFactory(resource=self, user=item[0], role=item[1])
 
+        self.save()
+
 
 class UserResourceAccessFactory(factory.django.DjangoModelFactory):
     """Create fake resource user accesses for testing."""
@@ -72,6 +75,7 @@ class RecordingFactory(factory.django.DjangoModelFactory):
 
     class Meta:
         model = models.Recording
+        skip_postgeneration_save = True
 
     room = factory.SubFactory(RoomFactory)
     status = models.RecordingStatusChoices.INITIATED
@@ -90,6 +94,8 @@ class RecordingFactory(factory.django.DjangoModelFactory):
                         recording=self, user=item[0], role=item[1]
                     )
 
+            self.save()
+
 
 class UserRecordingAccessFactory(factory.django.DjangoModelFactory):
     """Create fake recording user accesses for testing."""