[REF] sale_timesheet: project/task generation from SO

When confirming a SO, only one project will be created, even if
some so lines would create a project. Only the first line will
create the project, the other will not be linked to its.
`project_id` field is added on so line, to keep track of the
generated project, as already done for the task.

The '_timesheet_service_generation' method has been rewritten
to be execute in batch and improve performance and prefetching.

On SO confirmation, no message are now post in chatter to avoid
having one message per so line that should have created a task.
A message is only posted when user manually add SO lines on
confirmed SO.

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