chore(celery): cleanup celery vars to match the others

[crankynetman]

I realized I didn't properly follow the pattern for our multi-instance scram thing with celery. Now, we do!

[github-actions]

Pytest Celery Scheduler Coverage

File	Coverage
All files	100%	✅

Minimum allowed coverage is 80%

Generated by 🐒 cobertura-action against 8a02f90

[github-actions]

Django Pytest/Behave Coverage

File	Coverage
All files	83%	✅
config/consumers.py	78%	✅
config/urls.py	69%	✅
config/settings/base.py	69%	✅
config/settings/local.py	72%	✅
scram/route_manager/admin.py	71%	✅
scram/route_manager/models.py	79%	✅
scram/route_manager/views.py	88%	✅
scram/route_manager/api/serializers.py	92%	✅
scram/route_manager/api/views.py	76%	✅
scram/shared/shared_code.py	56%	✅
scram/templates/403.html	91%	✅
scram/templates/404.html	91%	✅
scram/templates/base.html	99%	✅

Minimum allowed coverage is 50%

Generated by 🐒 cobertura-action against 8a02f90