Make API calls for 1st Class Vulnerabilities configurable per project

What does this MR do?

This MR allows the 1st class vulnerabilities API to be enabled/disabled per project.

Does this MR meet the acceptance criteria?

Conformity

• [N/A] Changelog entry
• [N/A] 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