remove staging app

esap/esap/esap_accounts_config.sqlite3

esap/esap/esap_config.sqlite3

esap/esap/esap_staging_config.sqlite3

esap/esap/settings/base.py

esap/esap/settings/dev.py

esap/esap/settings/docker.py

esap/esap/urls.py

esap/query/database_router.py

esap/query/templates/query/index.html

esap/rucio/database_router.py

esap/staging/__init__.py

esap/staging/admin.py

esap/staging/api/__init__.py

esap/staging/api/serializers.py

esap/staging/api/urls.py

esap/staging/api/views.py

esap/staging/apps.py

esap/staging/database_router.py

esap/staging/models.py

esap/staging/templates/staging/base.html