[FIX] stock_account:make cogs multi_company safe

Goal:
The aim of this commit is to make the cogs generation multi-company
safe.

Context:

Considering the situation in which company A has set a product P with
a real time valuation and company B didn't set the real time valuation
or has set it to manual;
Considering the user has selected both company in the switcher;
The user post an invoice for the product P.

Before this commit:
There isn't any cogs created for the invoice which is wrong.

After this commit:
Whatever the selected companies are, the cost selected will always be from
the company that created the invoice.

closes odoo/odoo#81348

Task: #2713607
Signed-off-by: Laurent Smet <las@odoo.com>

addons/sale_stock/tests/test_anglosaxon_account.py

@@ -9,6 +9,7 @@ class TestAngloSaxonAccounting(AccountTestInvoicingCommon):
     def setUpClass(cls):
         super().setUpClass()
         (cls.company_data['company'] + cls.company_data_2['company']).write({'anglo_saxon_accounting': True})
+        # fifo and real_time will be only set for company_A as product.category is company dependant
         product_category = cls.env['product.category'].create({
             'name': 'a random storable product category',
             'property_cost_method': 'fifo',
@@ -19,11 +20,6 @@ class TestAngloSaxonAccounting(AccountTestInvoicingCommon):
             'type': 'product',
             'categ_id': product_category.id,
         })
-        # Those values are company dependent and need to be explicitly set for both companies
-        product_category.with_context(force_company=cls.company_data_2['company'].id).write({
-            'property_cost_method': 'fifo',
-            'property_valuation': 'real_time',
-        })
 
     def test_cogs_should_use_price_from_the_right_company(self):
         """

addons/stock_account/models/account_move.py

@@ -106,6 +106,9 @@ class AccountMove(models.Model):
         '''
         lines_vals_list = []
         for move in self:
+            # Make the loop multi-company safe when accessing models like product.product
+            move = move.with_context(force_company=move.company_id.id)
+
             if not move.is_sale_document(include_receipts=True) or not move.company_id.anglo_saxon_accounting:
                 continue
 
@@ -116,11 +119,7 @@ class AccountMove(models.Model):
                     continue
 
                 # Retrieve accounts needed to generate the COGS.
-                accounts = (
-                    line.product_id.product_tmpl_id
-                    .with_context(force_company=line.company_id.id)
-                    .get_product_accounts(fiscal_pos=move.fiscal_position_id)
-                )
+                accounts = line.product_id.product_tmpl_id.get_product_accounts(fiscal_pos=move.fiscal_position_id)
                 debit_interim_account = accounts['stock_output']
                 credit_expense_account = accounts['expense']
                 if not credit_expense_account: