Add build service for vuln issues

This MR adds a service for building an issue from a vulnerability, per #250353 (closed). It also changes the "Create Issue" button to use the intermediate build issue rather than going directly to a newly created issue.

Screenshots (strongly suggested)

## What does this MR do?

Does this MR meet the acceptance criteria?

Conformity

• Changelog entry
• Documentation (if required)
• Code review guidelines
• Merge request performance guidelines
• Style guides
• [-] Database guides
• Separation of EE specific content

Availability and Testing

• Review and add/update tests for this feature/bug. Consider all test levels. See the Test Planning Process.
• Tested in all supported browsers
• [-] Informed Infrastructure department of a default or new setting change, if applicable per definition of done