### Steps to reproduce:

- Enable workorders in the settings
- Create a BOM for a product P with an operation: - OP1: Assembly line 1, duration 10 minutes
- Create and confirm an MO for 5 units of P
- Set a producing quantity of 2
- Validate the MO and create a back order

### Issues:

On each of the operations of the MO:

1) The quantity displayed is 0
2) The expected duration is the expected duration corresponding to the full initial demand e.g. 50 minutes

Note: Issues 1 is present even if the produced qty match the full demand of the MO.

### Cause of the issues:

1) The quantity displayed on the operations is the 'qty_remaining' independantly of the state of the MO. However, once the MO is done, this qty is set to 0 because the product have been produced.

2) The expected duration is a computed field that is not updated once the opeartion is done:
https://github.com/odoo/odoo/blob/45154cfdb044aea85ad72bb36348af7b77afd844/addons/mrp/models/mrp_workorder.py#L329-L333 However, finishing the operation will change the state to 'done' before the MO is backordered and the `qty_production` updated. In addition, the `_get_duration_expected` relied solely on the qty_production rather than also relying on the actual 'qty_produced':
https://github.com/odoo/odoo/blob/45154cfdb044aea85ad72bb36348af7b77afd844/addons/mrp/models/mrp_workorder.py#L786

### Fix:

1) Since we can not show different columns for each operation depending on their state, we rely on the state of the MO to determine which qty is the most relevant: the qty_remaining or the qty_produced

2) We update the expected duration depending on the qty_produced in case it was not manually set (which can be determined by comparing its current value with the expected value before the workorder is set as done)

opw-3873108
opw-4010550
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Forward-Port-Of: odoo/odoo#178094
Forward-Port-Of: odoo/odoo#171771