DEV: use new 'ignore allowed groups' site settings (#27670)

Instead of the deprecated 'min trust level to allow ignore' in order to reduce the number of deprecation notices in the logs.

This tweaks a few serializers so that the 'can_ignore_users?` property is always coming from the server and properly used on the client-side.

app/serializers/current_user_serializer.rb

@@ -147,7 +147,7 @@ class CurrentUserSerializer < BasicUserSerializer
   end
 
   def can_ignore_users
-    !is_anonymous && object.in_any_groups?(SiteSetting.ignore_allowed_groups_map)
+    scope.can_ignore_users?
   end
 
   def can_delete_all_posts_and_topics

app/serializers/user_serializer.rb

@@ -51,7 +51,9 @@ class UserSerializer < UserCardSerializer
                      :custom_avatar_template,
                      :has_title_badges,
                      :muted_usernames,
+                     :can_mute_users,
                      :ignored_usernames,
+                     :can_ignore_users,
                      :allowed_pm_usernames,
                      :mailing_list_posts_per_day,
                      :can_change_bio,
@@ -254,10 +256,18 @@ class UserSerializer < UserCardSerializer
     MutedUser.where(user_id: object.id).joins(:muted_user).pluck(:username)
   end
 
+  def can_mute_users
+    scope.can_mute_users?
+  end
+
   def ignored_usernames
     IgnoredUser.where(user_id: object.id).joins(:ignored_user).pluck(:username)
   end
 
+  def can_ignore_users
+    scope.can_ignore_users?
+  end
+
   def allowed_pm_usernames
     AllowedPmUser.where(user_id: object.id).joins(:allowed_pm_user).pluck(:username)
   end