[IMP] energy_selfconsumption: integration invoicing

This is the Trello card

In this branch we worked on the last point of the requirements:

1. Changing the relationship between contract template and self-consumption so that contract template is linked to the product.
2. On the other hand, the obtaining of information is modified so that when the project is activated, contracts are created taking the values ​​stored in self-consumption.

energy_selfconsumption/wizards/contract_generation_wizard.py

@@ -64,7 +64,14 @@ class ContractGenerationWizard(models.TransientModel):
                     "contract_template_id": self.selfconsumption_id.product_id.contract_template_id.id,
                 }
             )
+            # We use the next method from the contract model to update the contract fields with contract template
             contract._onchange_contract_template_id()
+            # Now, we need to update the name field using the code and display_name fields
+            name = _("""CUPS: %s\nOwner: %s\nInvoicing period: #START# - #END#""") % (
+                supply_point_assignation.supply_point_id.code,
+                supply_point_assignation.supply_point_id.owner_id.display_name,
+            )
+            contract.contract_line_ids.name = name
         # Update selfconsumption and distribution_table state
         self.selfconsumption_id.write({"state": "active"})
         self.selfconsumption_id.distribution_table_state("process", "active")