Remove admin user count from Users statistics

Avoid confusion of the statistics counts due to admin users also being
listed in the numbers for Users with highest role statistics.

ee/app/controllers/ee/admin/dashboard_controller.rb

@@ -17,7 +17,6 @@ module EE
       end
 
       def stats
-        @admin_count = ::User.admins.count
         @roles_count = ::ProjectAuthorization.roles_stats
       end
 

ee/app/views/admin/dashboard/stats.html.haml

@@ -7,12 +7,6 @@
     %td
       = User.count
 
-  - if @admin_count
-    %tr
-      %td Admin users
-      %td
-        = @admin_count
-
   - if @roles_count
     - @roles_count.each do |row|
       %tr

ee/changelogs/unreleased/remove_admin_count_from_users_statistics.yml

+---
+title: Remove admin user count from Users statistics
+merge_request: 25337
+author:
+type: changed

ee/spec/features/admin/admin_dashboard_spec.rb

@@ -24,7 +24,6 @@ describe 'Admin Dashboard' do
       it 'show correct amount of users per role' do
         visit admin_dashboard_stats_path
 
-        expect(page).to have_content('Admin users 1')
         expect(page).to have_content('Users with highest role developer 2')
         expect(page).to have_content('Users with highest role reporter 1')
       end