Clean up the repo a bit, and add some unit tests

• Add a bunch of unit tests for different workflows
• Rework the different util modules and merge them where relevant
• Resolve some TODO items in config.py (netmasks are now validated)
• Add some :term: directives to docstrings
• Resolve a pytest warning about an unregistered mark @pytest.mask.workflow

gso/utils/helpers.py

@@ -7,18 +7,9 @@ from orchestrator.types import UUIDstr
 
 from gso.products.product_blocks.router import RouterVendor
 from gso.products.product_types.router import Router
-from gso.services.crm import all_customers
 from gso.services.netbox_client import NetboxClient
 
 
-def customer_selector() -> Choice:
-    customers = {}
-    for customer in all_customers():
-        customers[customer["id"]] = customer["name"]
-
-    return Choice("Select a customer", zip(customers.keys(), customers.items()))  # type: ignore[arg-type]
-
-
 def available_interfaces_choices(router_id: UUID, speed: str) -> Choice | None:
     """Return a list of available interfaces for a given router and speed.