Remove orphaned unused snapshot in gatus tests (#179031)

tests/components/gatus/snapshots/test_event.ambr

@@ -1,65 +0,0 @@
-# serializer version: 1
-# name: test_event_setup_and_states[event.core_backend_service-entry]
-  EntityRegistryEntrySnapshot({
-    'aliases': list([
-      None,
-    ]),
-    'area_id': None,
-    'capabilities': dict({
-      <EventEntityCapabilityAttribute.EVENT_TYPES: 'event_types'>: list([
-        'start',
-        'healthy',
-        'unhealthy',
-        'resolved',
-      ]),
-    }),
-    'config_entry_id': <ANY>,
-    'config_subentry_id': <ANY>,
-    'device_class': None,
-    'device_id': <ANY>,
-    'disabled_by': None,
-    'domain': 'event',
-    'entity_category': None,
-    'entity_id': 'event.core_backend_service',
-    'has_entity_name': True,
-    'hidden_by': None,
-    'icon': None,
-    'id': <ANY>,
-    'labels': set({
-    }),
-    'name': None,
-    'object_id_base': None,
-    'options': dict({
-    }),
-    'original_device_class': None,
-    'original_icon': None,
-    'original_name': None,
-    'platform': 'gatus',
-    'previous_unique_id': None,
-    'suggested_object_id': None,
-    'supported_features': 0,
-    'translation_key': 'status_event',
-    'unique_id': '1234567890abcdef1234567890abcdef_backend_service_status_event',
-    'unit_of_measurement': None,
-  })
-# ---
-# name: test_event_setup_and_states[event.core_backend_service-state]
-  StateSnapshot({
-    'attributes': ReadOnlyDict({
-      <EventEntityStateAttribute.EVENT_TYPE: 'event_type'>: None,
-      <EventEntityCapabilityAttribute.EVENT_TYPES: 'event_types'>: list([
-        'start',
-        'healthy',
-        'unhealthy',
-        'resolved',
-      ]),
-      <EntityStateAttribute.FRIENDLY_NAME: 'friendly_name'>: 'Core Backend Service',
-    }),
-    'context': <ANY>,
-    'entity_id': 'event.core_backend_service',
-    'last_changed': <ANY>,
-    'last_reported': <ANY>,
-    'last_updated': <ANY>,
-    'state': 'unknown',
-  })
-# ---