Set danger variant to remove user/project

Update label for the remove buttons

app/views/admin/users/projects.html.haml

@@ -16,7 +16,7 @@
           .float-right
             %span.light.vertical-align-middle= group_member.human_access
             - unless group_member.owner?
-              = link_to group_group_member_path(group, group_member), data: { confirm: remove_member_message(group_member), testid: 'remove-user' }, method: :delete, remote: true, class: "btn btn-sm btn-danger gl-button btn-icon gl-ml-3", title: _('Remove user from group') do
+              = link_to group_group_member_path(group, group_member), data: { confirm: remove_member_message(group_member), confirm_btn_variant: 'danger', testid: 'remove-user' }, aria: { label: _('Remove') }, method: :delete, remote: true, class: "btn btn-sm btn-danger gl-button btn-icon gl-ml-3", title: _('Remove user from group') do
                 = sprite_icon('remove', size: 16, css_class: 'gl-icon')
 
 .row
@@ -46,7 +46,7 @@
                   %span.light.vertical-align-middle= member.human_access
 
                   - if member.respond_to? :project
-                    = link_to project_project_member_path(project, member), data: { confirm: remove_member_message(member) }, remote: true, method: :delete, class: "btn btn-sm btn-danger gl-button btn-icon gl-ml-3", title: _('Remove user from project') do
+                    = link_to project_project_member_path(project, member), data: { confirm: remove_member_message(member), confirm_btn_variant: 'danger' }, aria: { label: _('Remove') }, remote: true, method: :delete, class: "btn btn-sm btn-danger gl-button btn-icon gl-ml-3", title: _('Remove user from project') do
                       = sprite_icon('remove', size: 16, css_class: 'gl-icon')
 
 = render partial: 'admin/users/modals'