add ability to customize message before sending

app/jobs/send_submitter_invitation_email_job.rb

@@ -1,8 +1,10 @@
 # frozen_string_literal: true
 
 class SendSubmitterInvitationEmailJob < ApplicationJob
-  def perform(submitter)
-    SubmitterMailer.invitation_email(submitter).deliver_now!
+  def perform(params = {})
+    submitter = Submitter.find(params['submitter_id'])
+
+    SubmitterMailer.invitation_email(submitter, subject: params['subject'], body: params['body']).deliver_now!
 
     SubmissionEvent.create!(submitter:, event_type: 'send_email')