[FIX] stock: enable auto_join for stock_move_line <-> stock_picking

Avoid pathological SQL queries with extremely long list of ids in a
WHERE clause. The strong relation between these models make an auto_join
a no brainer.

closes odoo/odoo#32645

Signed-off-by: Damien Bouvy (dbo) <dbo@odoo.com>

addons/stock/models/stock_move_line.py

@@ -17,7 +17,7 @@ class StockMoveLine(models.Model):
     _order = "result_package_id desc, id"
 
     picking_id = fields.Many2one(
-        'stock.picking', 'Stock Picking',
+        'stock.picking', 'Stock Picking', auto_join=True,
         help='The stock operation where the packing has been made')
     move_id = fields.Many2one(
         'stock.move', 'Stock Move',