Add migrations for ParkPhoto and RidePhoto models with associated events

- Created ParkPhoto and ParkPhotoEvent models in the parks app, including fields for image, caption, alt text, and relationships to the Park model.
- Implemented triggers for insert and update operations on ParkPhoto to log changes in ParkPhotoEvent.
- Created RidePhoto and RidePhotoEvent models in the rides app, with similar structure and functionality as ParkPhoto.
- Added fields for photo type in RidePhoto and implemented corresponding triggers for logging changes.
- Established necessary indexes and unique constraints for both models to ensure data integrity and optimize queries.

backend/apps/accounts/serializers.py

@@ -1,7 +1,6 @@
 from rest_framework import serializers
 from django.contrib.auth import get_user_model
 from django.contrib.auth.password_validation import validate_password
-from django.core.exceptions import ValidationError
 from django.utils.crypto import get_random_string
 from django.utils import timezone
 from datetime import timedelta