[IMP] hr_payroll: Manage multi company on payslips/contracts

Purpose
=======

Currently the payroll doens't manage the multi company

Specification
=============

1/ Add ir.rules on hr.contract and hr.payslip to prevent users
   to access a record in another company.
2/ Add ir.rules on hr.payroll.structure to prevent users to access
   a record for another country.
3/ Remove company_id fields on models that doesn't require it, as
   hr.salary.rule.category.
4/ Make the accounting fields on the salary rules company dependent.
5/ Specify the country on the salary structures on the
   l10n_**_hr_payroll modules.
6/ Add demo data and modify the salary package tour.
7/ Make the car_atn and company_car_total_depreciated_costs fields
   compute_sudo=True, as one car can be assigned on several contract,
   for different companies

Closes #26866
Closes #25231
Closes #24683
Closes #23814

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