Add request-URL to security finding modal

What does this MR do and why?

Currently, the security finding modal does not display the request-URL for DAST findings. This MR adds this.

Screenshots or screen recordings

Before	After

How to set up and validate locally

1. Enable the standalone_finding_modal feature flag
2. Go to a pipeline's security report
3. Filter for DAST
4. Open finding (e.g.: "CWE-693 in")
5. Verify that the URL renders

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 #419299 (closed)