Add dependency paths drawer to Vulnerability Details

What does this MR do and why?

Adds the dependency paths drawer (UI only!) to the vulnerability details page.

🚨 Note: there are still a lot of unknown as the BE is still being worked on. The main purpose of this MR is to get the button-drawer functionality working. discussion thread

Issue: #519962 (closed)

References

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Before	After

How to set up and validate locally

1. Enable feature flag: dependency_paths
2. Clone this project: https://gitlab.com/gitlab-examples/security/security-reports
3. Run a successful pipeline
4. Go to the vulnerability report page
5. Click on a vulnerability
6. Clicking on the dependency path button will trigger the drawer and display some dummy data

Related to #519962 (closed)