fix: resolve broken migration dependencies and references after company app removal

- Updated migration files to remove references to the old `companies` app and replace them with new app dependencies (`operators` and `manufacturers`).
- Fixed foreign key references in migration files to point to the correct models in the new apps.
- Updated import statements in management commands and test files to reflect the new app structure.
- Completed a thorough validation of the migration system to ensure full functionality and operational status.

parks/management/commands/seed_ride_data.py

@@ -1,6 +1,6 @@
 from django.core.management.base import BaseCommand
 from django.utils import timezone
-from companies.models import Manufacturer
+from manufacturers.models import Manufacturer
 from parks.models import Park
 from rides.models import Ride, RollerCoasterStats
 from decimal import Decimal