Add vulnerabilities field to QueryType

What does this MR do?

• Adds vulnerabilities field to QueryType
• Adds InstanceSecurityDashboard#vulnerabilities

These additions will support the vulnerability list feature on the instance security dashboard.

Issue: #207440 (closed)

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.