Draft: Security scanning MR widget PoC

What does this MR do and why?

This is a PoC using client-side dummy data to implement the security scanning MR widget.

Screenshots or screen recordings

expected design	implementation

How to set up and validate locally

1. You might need to enable the refactor_mr_widgets_extensions feature flag:

   Feature.enable(:refactor_mr_widgets_extensions)

2. Open any MR.

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.

/cc @svedova