[FIX] mrp: bunch of fixes

Bunch of last minute fixes including:
- serial handling in tablet view
- expected durations and backorders
- button unplan unlinks the leave but the computed aren't recomputed
  then we need to manually set the date_planned_start/finished
  then we need to not propagate them on the related document
  (move/production) because they are required
- operation company_id wrongly set

task-2241471