Flag to us when an employee is not eligible for SSP Merged

When employee's are not eligible for SSP, we should be notified so that we are then able to inform the client that they need to provide the employee with an SSP1 form. Potentially a payment warning for this for when employee's are not eligible due to average weekly earnings being too low and also when they come to the end of their 28 weeks, similarly to the SMP 39 week payment warning.

We currently have to manually check each employee's profile who have SSP which is not feasible, especially for our bigger clients.