Enable rule mode UI for dependency scanning

What does this MR do and why?

Note: This MR should only be merged once !103210 (merged) has reached production.

Enables the scan execution policy rule mode UI for Dependency Scanning.

Dependency scanning backend support is added in !103210 (merged). This MR enables the rule mode UI to handle policies that contain dependency_scanning actions.

Screenshots or screen recordings

Screenshots

How to set up and validate locally

Numbered steps to set up and validate the change are strongly suggested.

1. Navigate to a project => Security & Compliance => Policies => New policy => Scan Execution
2. Select Dependency Scanning from the dropdown

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 #378428 (closed)