Purpose
=======

This PR is in continuity of #62360 and #62900 done in 14.0. 
The goal of this PR essentially updates and improves the changes done in 14.0.

## Details

- Remove the context key added in 14.0 to keep the 'Create Sale Order' button in task and helpdesk.ticket. Because at the end we remove this button in these models.
- Remove non_allow_billable field in tasks and timesheets.
- Remove the partner_email from task form view.
- Remove timesheet_product_id from task form view
- Merge sale_timesheet_edit module with sale_timesheet module.
- Remove timesheet table in portal sales order and invoice (deprecated templates in #62900).
- Remove override of project kanban controller (deprecated file from #62360).
- Store remaining_hours field in sale.order.line model (this field has been introduced in the following PR #62900).
- Remove _onchange_task_id_employee_id, the process in the method is done in _compute_so_line.
- Merge bill_type and pricing_type in project.project.
- Move partner_id field in project form view.
- Remove value selected in SO and SOL in project if the customer does not fit with the SO selected.
- Changes SOL in mapping when the pricing type of the current project is "employee rate" if the customer changes.
- Hide the timesheet_product_id field if the project is not a fsm project.
- Move sql constraint for timesheet_product_id in industry_fsm_sale, because this field is no longer mandatory in project which is not fsm project.
- Changes the search of timesheets in portal > timesheets. 
    - we allows the user to search with name of SO and invoice to find the timesheets about the wanted SO or invoice rathan than the id of SOL and invoice.
- Move View Timesheets button in portal > invoice
- Remove deprecated codes.
- Miscellaneous fixes.

Task-2424382

Co-authored-by: Laurent Stukkens (LTU) <ltu@odoo.com>

Purpose
======
This PR is in continuity of #15025 and #15264 done in 14.0.
The goal of this PR essentially updates and improves the changes done in 14.0.

## Details

- Remove 'create sale order' button in helpdesk.ticket.
- Changes the project field in related and stored field and remove task field in helpdesk.ticket model. Because
    - we don't need to link a ticket to a task to sale timesheets in ticket.
    - the project is always the project defined in the helpdesk.team linked to helpdesk.ticket. That's why this field is now a related and stored field.
- Store sale_line_id field in ticket.
- Merge helpdesk_sale_timesheet_edit module in helpdesk_sale_timesheet module.
- Update the search to get the last SOL of customer set in the helpdesk.ticket.
- compute sudo and store total_hours_spent field in helpdesk.ticket to get the total of all timesheets contained in the ticket.
- Remove bill_type field, because this field has been merged with the pricing_type field in sale_timesheet module.
- Add constraint to check if a timesheet is not linked to a task and a ticket at the same time.
- Restrict the pricing type of helpdesk projects to task rate only.
- Create helpdesk_fsm_sale module to make the bridge between the helpdesk_sale_timesheet and industry_fsm_sale.
- Remove the SO set in the project if this project has been changed to fsm project.
- Move and update the constraint for timesheet_product_id from sale_timesheet to industry_fsm_sale because this field is only required for fsm projects.
- Hide planned_hours, forecast_hours and effective_hours fields in planning.slot form view.
- Remove deprecated code.

Related PRs: 

- Community: odoo/odoo#64474
- Upgrade: odoo/upgrade#2080

Task-2424382