Remove unused scope option

What does this MR do and why?

Remove unused scope option

• the scope option was incorrectly added
• removing it to match designs

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 => New policy => Scan execution policy
6. Verify the scope option "all projects in groups" is unavailable

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 #551476 (closed)