chore: Add delay for slack job when message has attachments (#7107)

app/jobs/send_on_slack_job.rb

@@ -0,0 +1,8 @@
+class SendOnSlackJob < ApplicationJob
+  queue_as :medium
+  pattr_initialize [:message!, :hook!]
+
+  def perform
+    Integrations::Slack::SendOnSlackService.new(message: message, hook: hook).perform
+  end
+end