An empty default for GOOGLE_SITE_VERIFICATION_ID

CHANGELOG.md

 - Role: edxapp
+  - Added GOOGLE_SITE_VERIFICATION_ID to move a previously hardcoded value into configuration.
   - Changed `EDXAPP_RETIRED_USERNAME_FMT` to `EDXAPP_RETIRED_USERNAME_PREFIX`. Changed/split `EDXAPP_RETIRED_EMAIL_FMT` to be `EDXAPP_RETIRED_EMAIL_PREFIX` and `EDXAPP_RETIRED_EMAIL_DOMAIN`.
 
 - Role xqueue

playbooks/roles/edxapp/defaults/main.yml

@@ -499,6 +499,9 @@ EDXAPP_PRIVATE_REQUIREMENTS:
 EDXAPP_EXTRA_MIDDLEWARE_CLASSES: []
 
 EDXAPP_GOOGLE_ANALYTICS_ACCOUNT: "None"
+EDXAPP_GOOGLE_ANALYTICS_LINKEDIN: ""
+EDXAPP_GOOGLE_ANALYTICS_TRACKING_ID: ""
+EDXAPP_GOOGLE_SITE_VERIFICATION_ID: ""
 
 EDXAPP_OPTIMIZELY_PROJECT_ID: "None"
 EDXAPP_TRACKING_SEGMENTIO_WEBHOOK_SECRET: ""
@@ -511,8 +514,7 @@ EDXAPP_EDX_API_KEY: "PUT_YOUR_API_KEY_HERE"
 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
@@ -1343,6 +1345,7 @@ lms_env_config:
   ACE_ROUTING_KEY: "{{ EDXAPP_ACE_ROUTING_KEY }}"
   ENTERPRISE_TAGLINE: "{{ EDXAPP_ENTERPRISE_TAGLINE }}"
   ANALYTICS_API_URL: "{{ EDXAPP_LMS_ANALYTICS_API_URL }}"
+  GOOGLE_SITE_VERIFICATION_ID: "{{ EDXAPP_GOOGLE_SITE_VERIFICATION_ID }}"
 
 cms_auth_config:
   <<: *edxapp_generic_auth