chore: add register flag to latest (#1603)

Author: metal-messiah

.github/actions/build-ab/templates/latest.js

@@ -4,7 +4,7 @@ window.NREUM.loader_config.licenseKey = '{{{args.abLicenseKey}}}'
 window.NREUM.info.applicationID = '{{{args.abAppId}}}'
 window.NREUM.info.licenseKey = '{{{args.abLicenseKey}}}'
 window.NREUM.init.proxy.assets = 'https://staging-js-agent.newrelic.com/dev'
-window.NREUM.init.feature_flags = ['soft_nav','ajax_metrics_deny_list', 'user_frustrations']
+window.NREUM.init.feature_flags = ['soft_nav','ajax_metrics_deny_list', 'user_frustrations', 'register']
 window.NREUM.init.session_replay.enabled = true // feature is enabled, but the app settings will have sampling at 0.  We can proactively enable SR for certain test cases through app settings
 window.NREUM.init.session_trace.enabled = true // feature is enabled, but the app settings will have sampling at 0.  We can proactively enable SR for certain test cases through app settings
 window.NREUM.init.user_actions = {elementAttributes: ['id', 'className', 'tagName', 'type', 'ariaLabel', 'alt', 'title']}