[MM-39060] - A/B Test: Reminder to Join Workspace email (#18894)

* [MM-39060] - A/B Test: Reminder to Join Workspace email

* Fix error and add error handling

* feedback impl

* run make i18n-extract

* improvements

* make i18n-extract

* setup ability to do telemetry on reminder invite emails

* improvement

* add telemetry

Co-authored-by: Mattermod <mattermod@users.noreply.github.com>

i18n/en.json

@@ -3267,6 +3267,10 @@
     "id": "api.templates.invite_body.title",
     "translation": "{{ .SenderName }} invited you to join the {{ .TeamDisplayName }} team."
   },
+  {
+    "id": "api.templates.invite_body.title.reminder",
+    "translation": "Reminder"
+  },
   {
     "id": "api.templates.invite_body_footer.info",
     "translation": "Mattermost is a flexible, open source messaging platform that enables secure team collaboration."