refactor: rename apply_event to apply

tests/test_classified_ad.py

@@ -248,7 +248,7 @@ def test_classified_ad_is_instance_of_entity():
     assert isinstance(ad, Entity)
 
 
-def test_classified_ad_can_use_entity_apply_event():
+def test_classified_ad_can_use_entity_apply():
     ad = ClassifiedAd(
         id=ClassifiedAdId(value=uuid4()),
         _ownerId=UserId(value=uuid4()),
@@ -258,7 +258,7 @@ def test_classified_ad_can_use_entity_apply_event():
     )
     event = ClassifiedAdSentForReview(id=ad.id.value)
 
-    updated_ad = ad.apply_event(event)
+    updated_ad = ad.apply(event)
 
     assert updated_ad.get_changes() == (ad.get_changes()[0], event)
     assert len(ad.get_changes()) == 1