Add GOOGLE_ANALYTICS_TRACKING_ID setting

CHANGELOG.md

+- Role: edxapp
+  - Added GOOGLE_ANALYTICS_TRACKING_ID setting for inserting GA tracking into emails generated via ACE.
+
 - Role: notifier
   - Added notifier back to continuous integration.
 

playbooks/roles/edxapp/defaults/main.yml

@@ -454,6 +454,7 @@ EDXAPP_VERIFY_STUDENT:
   DAYS_GOOD_FOR: 365
   EXPIRING_SOON_WINDOW: 28
 EDXAPP_GOOGLE_ANALYTICS_LINKEDIN: ""
+EDXAPP_GOOGLE_ANALYTICS_TRACKING_ID: ""
 EDXAPP_CONTENTSTORE_ADDITIONAL_OPTS: {}
 EDXAPP_BULK_EMAIL_EMAILS_PER_TASK: 500
 # If using microsites this should point to the microsite repo
@@ -1156,6 +1157,7 @@ lms_auth_config:
   EDX_API_KEY: "{{ EDXAPP_EDX_API_KEY }}"
   VERIFY_STUDENT: "{{ EDXAPP_VERIFY_STUDENT }}"
   GOOGLE_ANALYTICS_LINKEDIN: "{{ EDXAPP_GOOGLE_ANALYTICS_LINKEDIN }}"
+  GOOGLE_ANALYTICS_TRACKING_ID: "{{ EDXAPP_GOOGLE_ANALYTICS_TRACKING_ID }}"
   CC_PROCESSOR_NAME: "{{ EDXAPP_CC_PROCESSOR_NAME }}"
   CC_PROCESSOR: "{{ EDXAPP_CC_PROCESSOR }}"
   TRACKING_SEGMENTIO_WEBHOOK_SECRET: "{{ EDXAPP_TRACKING_SEGMENTIO_WEBHOOK_SECRET }}"