[IMP] sale_timesheet: billing time at employee rate

When a project become billable, the employee can now timesheet
on a same task, at different rate.
The project should be linked to a SO, and the mapping between
the employee and the SO line will be done using 2 mecanisms:

1/ task rate: the SO line set on the task is chosen for any employee
timesheeting on the task.

2/ employee rate: a map exists on the project, matching employee
with an SO line from the SO of the project. If the employee is not in
the map, the fallback will be the SO from the task, or the one from
the project.
This makes the SO line on the task always visible.

The billable type of a project depends on if the map is filled
or not. There is 2 ways of making a project billable:
- project is created from SO confirmation (depending of product
configuration)
- through the wizard "Create Sales Order": a SO will be created
and the project will be associated to it.

The subtask should follow the configuration of its parent
project (and not parent task).

Task #34703
Closes #26111

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