**Issue**
Lots manually indicated on stock move lines can be overridden when producing a Manufacturing Order.

**Steps to reproduce**
- Create a storable product P tracked by lot
- Create two lots for product P with 2 units each
- Create a MO for a product consuming two units P and confirm it
- On the raw move, manually set 1 unit for each lot
- Click on "Produce All"
- Check the move line associated to the product P -> 2 units associated to the first lot consumed instead of 1 unit each

**Cause**
While producing:
https://github.com/odoo/odoo/blob/0fe2023dc57b6cc02bd399d3c8fc5d6c8ed6e833/addons/mrp/models/mrp_production.py#L2109-L2110 It sets the quantities:
https://github.com/odoo/odoo/blob/0fe2023dc57b6cc02bd399d3c8fc5d6c8ed6e833/addons/mrp/models/mrp_production.py#L2246 This calls `_set_quantity_done_prepare_vals` with a qty of 2: https://github.com/odoo/odoo/blob/0fe2023dc57b6cc02bd399d3c8fc5d6c8ed6e833/addons/stock/models/stock_move.py#L2264 which will, for each move line:
- Take the quantity indicated by move line: https://github.com/odoo/odoo/blob/0fe2023dc57b6cc02bd399d3c8fc5d6c8ed6e833/addons/stock/models/stock_move.py#L2274 https://github.com/odoo/odoo/blob/0fe2023dc57b6cc02bd399d3c8fc5d6c8ed6e833/addons/stock/models/stock_move.py#L2296-L2297
- Then take all the available quantity left for the lot associated to the move line: https://github.com/odoo/odoo/blob/0fe2023dc57b6cc02bd399d3c8fc5d6c8ed6e833/addons/stock/models/stock_move.py#L2302-L2309 https://github.com/odoo/odoo/blob/0fe2023dc57b6cc02bd399d3c8fc5d6c8ed6e833/addons/stock/models/stock_move.py#L2326-L2327 Instead of first taking all the quantity indicated by the move line, before checking available quantity

**Solution**
Assume that raw move lines being created in mrp without changing the producing quantity are manually created

opw-5946439

Forward-Port-Of: odoo/enterprise#112837