DEV: Deprecate FoundUserWithStatusSerializer (#25883)

A followup to b3a11994.

app/serializers/found_user_with_status_serializer.rb

@@ -6,5 +6,16 @@ class FoundUserWithStatusSerializer < FoundUserSerializer
   def initialize(object, options = {})
     super
     options[:include_status] = true
+    deprecated
+  end
+
+  private
+
+  def deprecated
+    message =
+      "FoundUserWithStatusSerializer is deprecated. " \
+        "Use FoundUserSerializer with the include_status option instead."
+
+    Discourse.deprecate(message, since: "3.2.0", drop_from: "3.3.0.beta1")
   end
 end