Add 'Work Pattern' filter to the 'Filters for employees' page when assigning work patterns in bulk

We have two different work patterns for many of our employees, one used in the summer and one used in the winter, and have to switch those patterns twice a year.

It would be very useful to be able to find all employees by their current work pattern (for example, find everyone on "Glasshouse (Winter)" when we want to move everyone to "Glasshouse (Summer)"). Currently we have to filter by a few departments and then exclude some employees from those departments in order to get the correct employees selected.