Update frontend to use new call to build an issue from a vulnerability

Why are we doing this work

The workflow proposed in #250353 (closed) requires a change to the route called when building an issue from a vulnerability. The work for this was previously done in !46503 (diffs), but that MR needed to be broken up due to its complexity.

Relevant links

• Initial Issue (includes implementation plan)
• Route change implementation
• Implementation in previous (closed) MR

Non-functional requirements

• Documentation: Documentation change needs to update what happens when the Create Issue button is pressed
• Testing: Specs need to be updated
• Changelog: A changelog will be required for this change

Implementation plan

• frontend Update front-end to call new route
  • No longer need back and forth using axios, just a simple get call
• backend Update VulnerabilityHelper to point to the new route.