The derived cloud_provider_enabled is placed inside extra_params so that
openstack-cloud-controller-manager gets applied correctly. This required
change was unfortulately missed in https://review.opendev.org/681922.
Additionally improve the docs related to cloud_provider_enabled label.
Story: 2006531
Task: 36740
Change-Id: I4a89d25b467edd2c4be608c37055706e4e62d78b