[FIX] stock: Fix forecast availability with UoM

virtual_available return the quantity in product base UoM while
move product_uom_qty is the quantity with the UoM of the move

For the forecast compare the quantity with the same UoM

closes odoo/odoo#71732

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

addons/stock/models/stock_move.py

@@ -897,7 +897,7 @@ class StockMove(models.Model):
         warehouse = self.location_dest_id.warehouse_id
         forecast_availability = self.product_id.with_context(warehouse=warehouse.id, to_date=self.date).virtual_available
         if self.state == 'draft':
-            forecast_availability += self.product_uom_qty
+            forecast_availability += self.product_qty
         return forecast_availability
 
     @api.onchange('product_id', 'picking_type_id')