Sorts the expected labels in the note

The sorting we assume is not guaranteed when the ID reaches
double digits because we sort it by reference string

This fixes the problem by sorting the expectation by
reference string too

ee/spec/services/ee/resource_events/merge_into_notes_service_spec.rb

@@ -44,11 +44,12 @@ describe ResourceEvents::MergeIntoNotesService do
 
       notes = described_class.new(resource, user).execute
 
+      added_scoped_labels_refs = [scoped_label_group1_2, scoped_label_group2_1, scoped_label_group3_1].map(&:to_reference).sort.join(' ')
+      removed_scoped_labels_refs = [scoped_label_group1_1, scoped_label_group2_2].map(&:to_reference).sort.join(' ')
+
       expected = [
-        "added #{scoped_label_group1_2.to_reference} #{scoped_label_group2_1.to_reference} " \
-          "#{scoped_label_group3_1.to_reference} scoped labels " \
-          "and automatically removed " \
-          "#{scoped_label_group1_1.to_reference} #{scoped_label_group2_2.to_reference} labels",
+        "added #{added_scoped_labels_refs} scoped labels " \
+          "and automatically removed #{removed_scoped_labels_refs} labels",
         "added #{label.to_reference} label and removed #{label2.to_reference} label",
         "added #{label.to_reference} label",
         "added #{label2.to_reference} label"