This update removes outdated setup logic and hidden settings that are no longer needed because Field Service projects are now billable by default. The change helps keep the system simpler and reduces the chance of inconsistent project configuration behind the scenes.

Related to the community PR: https://github.com/odoo/odoo/pull/215114 We remove some unused code about the 'partner_id' blacklist fields, and remove some context keys as we make the projects billable by default now.

task-4700746

This update fixes Swiss payroll handling for employee record versions, including occupation period calculations and warning redirects. It also simplifies payroll batch processing by using standard pay runs, helping reduce errors and improve consistency for payroll teams.

In this PR we fix :
- The occupation period computation
- Employee warning system to get proper redirection on the correct version
- Removing the customized batch wizard in favor of payruns
- Properly inheriting the hr employee view