Add details section to new vulnerability page

What does this MR do and why?

This commit is part of a commit series which aim to create a new form to add a vulnerability manually. This batch creates the details section.

Screenshots or screen recordings

How to set up and validate locally

1. Navigate to /-/security/vulnerabilities/new through the URL (should be a project scope)
2. The page should render the details section
3. These fields will do nothing, that functionality will be added on subsequent MRs

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 #301003 (closed)