Draft: rebase attempt
POC, never merge.
To test:
ddev drush si --yes && ddev drush en --yes experience_builder xb_dev_mode \
xb_dev_standard xb_test_sdc xb_personalization_demo --yes \
&& ddev drush upwd admin admin
Then check:
https://drupal.ddev.site/personalization-test
https://drupal.ddev.site/personalization-test?utm_campaign=HALLOWEEN
Closes #3525565
Edited by Christian López Espínola