N1C. Support multiple namespaces

[mjang]

Is your feature request related to a problem? Please describe

Functionality already exists in XC

• In test for NGINX One Console
• Changelog: Updated change log for namespace release #434
• Doc change: link to https://docs.cloud.f5.com/docs-v2/multi-cloud-app-connect/how-to/app-security/service-policy, per feature: link to XC docs to create a namespace, update glossary #435

[mjang]

As shown in the description, the relevant PRs are merged (and released) as of April 30. Therefore, I'm closing this issue as complete.