[FIX] stock: empty reusable package

When using reusable package in chained transfers, indicates the package
should not be propagated for the next moves `result_package_id`.
This change has no effect by itself, but it's used in enterprise by
https://github.com/odoo/enterprise/pull/13146/commits/611b2c0b188ab9906eb21feab087a1794bd2d015 when Picking Batch is enabled
and barcode app is installed.

task-2333834

X-original-commit: 6677f501d5a1717af8da08a7e235d87aeb85f862

addons/stock/models/stock_picking.py

@@ -848,9 +848,11 @@ class Picking(models.Model):
                             'move_line_ids': [(6, 0, move_lines_to_pack.ids)],
                             'company_id': picking.company_id.id,
                         })
-                        move_lines_to_pack.write({
-                            'result_package_id': pack.id,
-                        })
+                        # TODO: in master, move package field in `stock` and clean code.
+                        if pack._allowed_to_move_between_transfers():
+                            move_lines_to_pack.write({
+                                'result_package_id': pack.id,
+                            })
                     else:
                         move_lines_in_package_level = move_lines_to_pack.filtered(lambda ml: ml.move_id.package_level_id)
                         move_lines_without_package_level = move_lines_to_pack - move_lines_in_package_level

addons/stock/models/stock_quant.py

@@ -729,3 +729,6 @@ class QuantPackage(models.Model):
 
     def _get_contained_quants(self):
         return self.env['stock.quant'].search([('package_id', 'in', self.ids)])
+
+    def _allowed_to_move_between_transfers(self):
+        return True