Allow markdown in Solutions field for vulnerability details pages

Proposal

The contents of the Solution field can sometimes contain rich content. We should render the contents of the Solution field as markdown on the Vulnerability details pages.

Verification Steps

1. Access a project with access to the vulnerability report (Ultimate license)
2. From the Vulnerability Report, click the Submit Vulnerability button in the upper right to create a manual vulnerability. Add content with markdown in the Solution text box. Click Submit. (you'll need to fill out all required fields to save)
3. Confirm the newly created vulnerability properly renders the markdown (example).