Remove deprecate pagination component: Update design management toolbar to use GlButton

Currently, https://gitlab.com/gitlab-org/gitlab/blob/9fb74ec5c2c993f79dd082905c4bc204704a333b/ee/app/assets/javascripts/design_management/components/toolbar/pagination.vue isn't using a GitLab UI component. This issue is to update the pagination-button with GlButton.