OSDOCS-15960#moving from TP to GA

[brendan-daly-red-hat]

Versions: 4.21+

Issue: https://issues.redhat.com/browse/OSDOCS-15960

Link to docs preview:

• Enabling a user-managed DNS (Module is in multiple GCP assemblies)
• Provisioning your own DNS records (Module is in multiple GCP assemblies)
• Additional Google Cloud Platform (GCP) configuration parameters

QE review:

• [ ] QE has approved this change.

Additional information: