DEV: Separate admins and moderators on about page (#31272)

This PR does some things to the about page:

- Hide the stat if there are 0 admins/moderators.
- Count admins and moderators separately, so a user who is both will add
to both counts.
- A user who is both will still show up as a moderator, even if `admins`
is hidden.

app/assets/javascripts/discourse/app/components/about-page.gjs

@@ -37,6 +37,7 @@ export default class AboutPage extends Component {
       {
         class: "members",
         icon: "users",
+        display: true,
         text: i18n("about.member_count", {
           count: this.args.model.stats.users_count,
           formatted_number: I18n.toNumber(this.args.model.stats.users_count, {
@@ -47,6 +48,7 @@ export default class AboutPage extends Component {
       {
         class: "admins",
         icon: "shield-halved",
+        display: this.adminsCount > 0,
         text: i18n("about.admin_count", {
           count: this.adminsCount,
           formatted_number: I18n.toNumber(this.adminsCount, { precision: 0 }),
@@ -55,6 +57,7 @@ export default class AboutPage extends Component {
       {
         class: "moderators",
         icon: "shield-halved",
+        display: this.moderatorsCount > 0,
         text: i18n("about.moderator_count", {
           count: this.moderatorsCount,
           formatted_number: I18n.toNumber(this.moderatorsCount, {
@@ -65,6 +68,7 @@ export default class AboutPage extends Component {
       {
         class: "site-creation-date",
         icon: "calendar-days",
+        display: true,
         text: this.siteAgeString,
       },
     ];
@@ -253,10 +257,12 @@ export default class AboutPage extends Component {
       <div class="about__left-side">
         <div class="about__stats">
           {{#each this.stats as |stat|}}
+            {{#if stat.display}}
               <span class="about__stats-item {{stat.class}}">
                 {{icon stat.icon}}
                 <span>{{stat.text}}</span>
               </span>
+            {{/if}}
           {{/each}}
         </div>
 

app/models/about.rb

@@ -67,7 +67,8 @@ class About
   def moderators
     @moderators ||=
       apply_excluded_groups(
-        User.where(moderator: true, admin: false).human_users.order(last_seen_at: :desc),
+        User.where(moderator: true).human_users.order(last_seen_at: :desc),
+        ignore_groups: [Group::AUTO_GROUPS[:admins]],
       )
   end
 
@@ -75,7 +76,10 @@ class About
     @admins ||=
       DiscoursePluginRegistry.apply_modifier(
         :about_admins,
-        apply_excluded_groups(User.where(admin: true).human_users.order(last_seen_at: :desc)),
+        apply_excluded_groups(
+          User.where(admin: true).human_users.order(last_seen_at: :desc),
+          ignore_groups: [Group::AUTO_GROUPS[:moderators]],
+        ),
       )
   end
 
@@ -139,8 +143,8 @@ class About
 
   private
 
-  def apply_excluded_groups(query)
-    group_ids = SiteSetting.about_page_hidden_groups_map
+  def apply_excluded_groups(query, ignore_groups: [])
+    group_ids = SiteSetting.about_page_hidden_groups_map - ignore_groups
     return query if group_ids.blank?
 
     query.joins(