Move all import workflows into separate product types

gso/translations/en-GB.json

gso/workflows/iptrunk/create_imported_iptrunk.py

gso/workflows/office_router/__init__.py

gso/workflows/office_router/create_imported_office_router.py

gso/workflows/router/create_imported_router.py

gso/workflows/site/create_imported_site.py

gso/workflows/super_pop_switch/__init__.py