Show descendant policies in compliance framework report

What does this MR do and why?

This MR displays policies from descendant groups in compliance framework report

MR acceptance checklist

Please evaluate this MR against the MR acceptance checklist. It helps you analyze changes to reduce risks in quality, performance, reliability, security, and maintainability.

Screencast

demo2

How to set up and validate locally

• Enable experiment Security policy scope under your group Settings ▶ General ▶ Permissions and group features
• Create few policies under Security ▶ Policies
• Create new subgroup
• Create few policies there
• Go back to top-level group
• Open Security ▶ Compliance center, Frameworks tab
• Edit compliance framework
• Observe list of linked policies including subgroup policy

Numbered steps to set up and validate the change are strongly suggested.

Related to #451711 (closed)