Update policy list on csp

What does this MR do and why?

Update policy list on csp

• update header to indicate the policies are instance-wide
• add badge next to header
• add banner designating it as a csp
• update tests

Changelog: changed

EE: true

References

Screenshots or screen recordings

Before	After

How to set up and validate locally

1. Upload a GitLab Ultimate license
2. Go to http://gdk.test:3443/rails/features and enable the security_policies_csp feature flag
3. Navigate to Admin => Settings => Security and compliance
4. Set the CSP group
5. Navigate to CSP group => Secure => Policies
6. Verify the new UX

MR acceptance checklist

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

Related to #552269 (closed)