revert changes to the router model

gso/api/v1/imports.py

...ersions/2023-11-21_6dbd6c4c04b4_add_ip_trunk_workflows.py

.../versions/2023-11-21_815033570ad7_add_router_workflows.py

..._0c904cf0b66b_update_router_model_vendor_from_type_to_.py

gso/products/__init__.py

gso/products/product_blocks/router.py

gso/products/product_types/router.py

gso/utils/helpers.py

gso/workflows/iptrunk/create_iptrunk.py

gso/workflows/iptrunk/migrate_iptrunk.py

gso/workflows/iptrunk/modify_trunk_interface.py

gso/workflows/iptrunk/terminate_iptrunk.py

gso/workflows/router/create_router.py

gso/workflows/router/terminate_router.py

gso/workflows/tasks/import_router.py

test/fixtures.py

test/imports/test_imports.py

test/utils/test_helpers.py

test/workflows/router/test_create_router.py