add submission tracking events

app/jobs/send_submitter_invitation_email_job.rb

@@ -4,6 +4,8 @@ class SendSubmitterInvitationEmailJob < ApplicationJob
   def perform(submitter)
     SubmitterMailer.invitation_email(submitter).deliver_now!
 
+    SubmissionEvent.create!(submitter:, event_type: 'send_email')
+
     submitter.sent_at ||= Time.current
     submitter.save
   end