Update policy drawer for csp policies

What does this MR do and why?

Update policy drawer for csp policies

• update source for csp policies
• update source for inherited csp policies

Changelog: changed

EE: true

References

Screenshots or screen recordings

Scenario	Screenshot
Project policy
Group policy
Instance policy
Instance policy in CSP group

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 => New policy => Scan execution => Create a new policy
6. Navigate to CSP group => Secure => Policies => Select the new policy
7. Verify the policy source says instance policy
8. Navigate to a different group/project => Secure => Policies => Select the inherited policy
9. Verify the policy source says it is an instance policy that is inherited

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 #552270 (closed)