[IMP] stock: assign quantities to services in batch

Since 2137e45bb5, services have their stock
quantities computed to 0. As it's the same value for all of them, we can
do it in one batch instead of iterating over products.

closes odoo/odoo#36214

Signed-off-by: Arnold Moyaux <amoyaux@users.noreply.github.com>

addons/stock/models/product.py

@@ -102,12 +102,13 @@ class Product(models.Model):
             product.outgoing_qty = res[product.id]['outgoing_qty']
             product.virtual_available = res[product.id]['virtual_available']
             product.free_qty = res[product.id]['free_qty']
-        for product in self - products:
-            product.qty_available = 0.0
-            product.incoming_qty = 0.0
-            product.outgoing_qty = 0.0
-            product.virtual_available = 0.0
-            product.free_qty = 0.0
+        # Services need to be set with 0.0 for all quantities
+        services = self - products
+        services.qty_available = 0.0
+        services.incoming_qty = 0.0
+        services.outgoing_qty = 0.0
+        services.virtual_available = 0.0
+        services.free_qty = 0.0
 
     def _product_available(self, field_names=None, arg=False):
         """ Compatibility method """