Allow republishing all documents via service

The code here is taken from the equivalent Rake task, which will be
deleted once all the tasks have been added to the bulk republishing UI

app/services/bulk_republisher.rb

@@ -10,4 +10,10 @@ def republish_all_organisation_about_us_pages
       )
     end
   end
+
+  def republish_all_documents
+    Document.find_each do |document|
+      PublishingApiDocumentRepublishingWorker.perform_async_in_queue("bulk_republishing", document.id, true)
+    end
+  end
 end

test/unit/app/services/bulk_republisher_test.rb

@@ -19,4 +19,21 @@ class BulkRepublisherTest < ActiveSupport::TestCase
       BulkRepublisher.new.republish_all_organisation_about_us_pages
     end
   end
+
+  describe "#republish_all_documents" do
+    test "queues all documents for republishing" do
+      queue_sequence = sequence("queue")
+
+      2.times do
+        document = create(:document)
+
+        PublishingApiDocumentRepublishingWorker
+          .expects(:perform_async_in_queue)
+          .with("bulk_republishing", document.id, true)
+          .in_sequence(queue_sequence)
+      end
+
+      BulkRepublisher.new.republish_all_documents
+    end
+  end
 end