Use segmented export for project vulnerability exports

What does this MR do and why?

This MR modified the vulnerability export mechanism to always utilise the segmented export functionality for project or groups. This unifies the export functionality and should help improve performance when attempting to export singular projects that have very significant amounts of vulnerabilities associated.

How to set up and validate locally

Navigate to the "vulnerability report" on any project with a set of tracked vulnerabilities and use the Export CSV button.

Related to #477783 (closed)