[MERGE] 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.

See subcommit for more details.

Task #34703
Closes #26111

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