Use tag filter for pending tag count on admin dashboard (#36404)

app/controllers/admin/dashboard_controller.rb

@@ -9,10 +9,16 @@ module Admin
 
       @pending_appeals_count = Appeal.pending.async_count
       @pending_reports_count = Report.unresolved.async_count
-      @pending_tags_count    = Tag.pending_review.async_count
+      @pending_tags_count    = pending_tags.async_count
       @pending_users_count   = User.pending.async_count
       @system_checks         = Admin::SystemCheck.perform(current_user)
       @time_period           = (29.days.ago.to_date...Time.now.utc.to_date)
     end
+
+    private
+
+    def pending_tags
+      ::Trends::TagFilter.new(status: :pending_review).results
+    end
   end
 end

spec/system/admin/dashboard_spec.rb

@@ -9,6 +9,7 @@ RSpec.describe 'Admin Dashboard' do
     before do
       stub_system_checks
       Fabricate :software_update
+      Fabricate :tag, requested_review_at: 5.minutes.ago
       sign_in(user)
     end
 
@@ -18,6 +19,7 @@ RSpec.describe 'Admin Dashboard' do
       expect(page)
         .to have_title(I18n.t('admin.dashboard.title'))
         .and have_content(I18n.t('admin.system_checks.software_version_patch_check.message_html'))
+        .and have_content('0 pending hashtags')
     end
 
     private