[IMP] sale_timesheet: prevent copying the sale order line when duplicating task
[IMP] sale_timesheet: prevent copying the sale order line when duplicating task

This would lead to a strange situation, where two tasks share the same sale order which means change on one would be reflected on the other.

Task-2047389      Closes #36360
ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo