Update integ-uid2-config.json

Author: abuabraham-ttd

scripts/azure-cc/conf/integ-uid2-config.json

@@ -12,6 +12,7 @@
   "optout_api_uri": "https://optout.uidapi.com/optout/replicate",
   "cloud_encryption_keys_metadata_path": "https://core.uidapi.com/cloud_encryption_keys/retrieve",
   "optout_s3_folder": "uid-optout-integ/",
+  "uid_instance_id_prefix": "unknown",
   "runtime_config_store": {
     "type": "http",
     "config" : {