Update scan execution policy drawer

What does this MR do and why?

Update scan execution policy drawer

• it now shows rules for cluster image scanning
• it does not display the cluster images being scanned

Changelog: changed

EE: true

NOTE: This is the first MR of a couple; this solves the issue of the UI saying that a valid policy will not run when it will, but does not handle listing out branches and clusters for cluster image scanning policies. That behavior needs to be worked out in the issue

Screenshots or screen recordings

Scan Execution Policy Type	Before	After
DAST - w/out branches		No visual change
DAST - w/ branches		No visual change
Cluster Image Scanning - w/out branches
Cluster Image Scanning - w/ branches

How to set up and validate locally

1. Ensure your GDK has a GitLab Ultimate license
2. Follow the snippet for creating scan execution policies
3. Create these policies from the docs
4. Navigate to Security & Compliance => Policies
5. Select scan execution policy projects of different types

MR acceptance checklist

This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.

• I have evaluated the MR acceptance checklist for this MR.

Related to #346188 (closed)