Payroll users can now edit multiple payslips directly from the list view, making bulk payroll adjustments faster and easier. A related automatic update behavior was removed to avoid issues when making changes across several payslips at once.

Allow batch edit on payslips tree view.

Also removes an onchange that could cause issue when editing in batch.

Task Id: 2501306

Payroll users can now add a payslip to a batch that has already been marked as paid. This helps handle exceptions, such as an employee who was missed in the original payment run, without creating a separate workaround.

Currently it is not possible to add a payslip in a paid batch.
But for example if an employee hasn't been paid, we want to be able to
add it's payslip to an already done batch.

Task Id: 2501307