Switch FF scope for agentic_sast_vr_ui

Scott Hamptonrequested to merge
agentic-sast-vr-ff-root-ancestor into master

What does this MR do and why?

Switch FF scope

Switch the agentic_sast_vr_ui FF scope to be the same as enable_vulnerability_resolution (example) which is a related feature flag.

This scope uses the root ancestor instead of the project.

References

Rollout issue: https://gitlab.com/gitlab-org/gitlab/-/issues/581248

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