[IMP] mrp: change workorder plan behavior

- Before, the auto-planning of workorder autorize overlaps between then.
E.g. if a workorder (WO1) begin at Now + 30min with a duration of 60 minutes
and we try to plan a new workorder (WO2) Now, this one will be plan now
until Now + 120 min (30 min of WO2 + 60 min of WO1 + 30 min of WO2).
In our case we don't want this behavior by default,
because in real case, it is not efficient to work on job A during
30 min, after change to pass to a other job B, and rework on A after
the job B.
But in a other hand, we need to accept overlaps with no-working hours
intervals. Then, rewritte the _plan_workorders method to take
these features in account.

Also small fix about the planning has been done:
- Due to the strong link of date_planned(_...)  between the MO and WO,
the replan of the late first WO was wrong.
If the MO is planned before now, then don't take in account
date_planned_start and try to plan WO as soon as possible.
- Also, fix error handling when the WO is planned before the
previous one.

task-2169447

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