[16.0][migrate][mrp_production_date_planned_finished] Improve Manufacturing Order Duration Management in Odoo 16

[nagybal]

Is your feature request related to a problem?
Yes, in Odoo 16, the planned duration of Manufacturing Orders (MO) can't be altered directly. While users can display and adjust the planned finish date, Odoo doesn't maintain the set duration when the MO is rescheduled. This results in the system defaulting to the Manufacturing Lead Time from the product template.

Issues Identified:
The new duration of the MO gets overridden, causing loss of user-defined durations.

1. Dragging MO in the calendar view changes the start date but doesn't keep the intended duration.
2. Using the hamburger-menu to adjust the finish date doesn't maintain the new duration.

Testing
The issue has been verified on runboat.

Describe the solution you'd like
Your add-on, mrp_production_date_planned_finished, resolves this problem. Please consider migrating it to support Odoo 16.

Describe alternatives you've considered

1. Make the date_planned_finished field visible by default in the MO form view.
2. Identify and remove the Python code that's resetting the MO duration to the manufacturing lead time.

Additional context
The current behavior is problematic as it disregards user-set durations for specific MOs, negating manual calculations made for production timings.

[nagybal]

@ivantodorovich could You please take a look?

[github-actions]

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