[MERGE][IMP] sale_timesheet: select project on Sale Order to create task

Purpose
=======

The 'service_tracking' selection field on the 'product.template' model in the 'sale_timesheet' module
had its 'task_new_project' option renamed to 'task_in_project'.

If one or more sale_order_line have a product configured with this option, a new 'project_id' field appears
on the sale_order under the 'Sales Information' section.
When a project_id is selected, the analytic account on the sale order is automatically changed
to this project's analytic account.

This allows handling more use cases on sale_order:
- If a sale_order_line has a service product with that new option and no project_id configured on the sale_order:
  -> create a new project based on the configured project_template_id and then create a task in that project
     (same behavior as before)
- If a sale_order_line has a service product with that new option and a project_id is configured on the sale_order:
  -> directly create a task in the selected project_id

The behavior does not change for the 3 other options ('no', 'task_global_project' and 'project_only').

Specs
=======
- Add project field on sale order in "other infos" tab, shows only when a product on the SO has the option activated
- If projec is selected on SO, create task in this project, otherwise it creates a new project (as before)
- Rename 'task_new_project' into "task_in_project"
- Allow to have the new option with project template
- Selectable projects on Sales Order are `billate_type` in 'no' and 'task_rate'
- Never link SO's project to SO or AA
- Add onchange on project_id to select this project's analytic account on the SO
- Non stored computed field to check if at least one SOL has the new option

Use cases
- 2 SOL with new option (no template) will create 2 tasks in SO's project
- 2 SOL with new options (one no template, one with) + 1 SOL "create new P no T" --> create 2 tasks in SO's project and one new project

Task #1915660

closes odoo/odoo#29772

Signed-off-by: Jérome Maes (jem) <jem@openerp.com>

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