[FIX] stock: immediate transfer in multi-step
[FIX] stock: immediate transfer in multi-step

- Activate multi-step routes
- Set Incoming Shipments: Receive goods in input, then quality and then
  stock (3 steps)
- Create an Immediate Transfer from 'WH/Input' to 'WH/Quality Control'
- Add 2 products, set a quantity
- Validate

Two immediate transfers are created, one for each product, while a
single planned transfer is expected.

This is because the `default_immediate_transfer`i key is polluting the
context.

opw-2180556
opw-2197720

closes odoo/odoo#45843

X-original-commit: 74ad073fd66ca4ff345aaf37a7245a8b93808cb3
Signed-off-by: Nicolas Martinelli (nim) <771435c469f83f6aa9c405ac5e1ed06314a94f2d@odoo.com>

ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo