Add support for modifying the IAS flavour in creation and modification workflows

Undo a bad rebase I did yesterday, where this functionality was already present

gso/workflows/l3_core_service/ias/create_ias.py

@@ -26,6 +26,7 @@ from gso.workflows.l3_core_service.base_create_l3_core_service import (
 from gso.workflows.l3_core_service.base_create_l3_core_service import (
     initial_input_form_generator as base_initial_input_form_generator,
 )
+from gso.workflows.l3_core_service.ias.shared import update_ias_subscription_model
 
 
 def initial_input_form_generator(product_name: str) -> FormGenerator:
@@ -61,6 +62,7 @@ def create_ias() -> StepList:
         >> create_subscription
         >> store_process_subscription(Target.CREATE)
         >> initialize_subscription
+        >> update_ias_subscription_model
         >> start_moodi()
         >> lso_interaction(provision_sbp_dry)
         >> lso_interaction(provision_sbp_real)