Added `reversal_payroll.uuids` to Get all payrolls for a company

What changed

We added a new field reversal_payroll_uuids: [] to the GET all payrolls for a company endpoint. Use an include param to configure whether to include reversal_payroll_uuids in the response.

This new field is an array that contains reversed payroll uuids, which can then be retrieved with GET a single payroll for more information. If a payroll was not reversed, the reversal_payroll_uuids array will be empty.

What problem this solves

Previously, the only way for partners to retrieve information on reversed payrolls was via GET approved payroll reversals.

However, it's useful to surface in payroll history views any payrolls that have been reversed since the payroll was submitted. A partner could only implement this previously by joining the responses of GET approved payroll reversals and GET all payrolls for a company, which is a non-performant and unnecessarily complex build.