Change notification requests to only count mentions (#31322)

app/models/notification_request.rb

@@ -47,6 +47,6 @@ class NotificationRequest < ApplicationRecord
   private
 
   def prepare_notifications_count
-    self.notifications_count = Notification.where(account: account, from_account: from_account, filtered: true).limit(MAX_MEANINGFUL_COUNT).count
+    self.notifications_count = Notification.where(account: account, from_account: from_account, type: :mention, filtered: true).limit(MAX_MEANINGFUL_COUNT).count
   end
 end

spec/models/notification_policy_spec.rb

@@ -9,7 +9,7 @@ RSpec.describe NotificationPolicy do
     let(:sender) { Fabricate(:account) }
 
     before do
-      Fabricate.times(2, :notification, account: subject.account, activity: Fabricate(:status, account: sender), filtered: true)
+      Fabricate.times(2, :notification, account: subject.account, activity: Fabricate(:status, account: sender), filtered: true, type: :mention)
       Fabricate(:notification_request, account: subject.account, from_account: sender)
       subject.summarize!
     end

spec/models/notification_request_spec.rb

@@ -8,7 +8,7 @@ RSpec.describe NotificationRequest do
 
     context 'when there are remaining notifications' do
       before do
-        Fabricate(:notification, account: subject.account, activity: Fabricate(:status, account: subject.from_account), filtered: true)
+        Fabricate(:notification, account: subject.account, activity: Fabricate(:status, account: subject.from_account), filtered: true, type: :mention)
         subject.reconsider_existence!
       end