When a user hit cancel while editing a product it took them to the spree
products index page instead of the bulk edit page. The button was part
of a shared view for all resources so changing it's actions were not
readily available.
It was suggested that instead of carrying our own separate controller
action we could just override the index action of the products
controller with the bulk edit functionality instead. This has the
advantage of removing some overrides and allows us to not add
additional overrides in the future.
