Create a graphQL based security dashboard

What does this MR do?

This MR does two things. I probably should have split them up, but they are closely related and I was on a roll.

Firstly, it updates the vulnerabilities-list component so it gets its data from GraphQL instead of the REST/Vuex endpoints. It replaces the pagination with infinite scrolling too because of the way the graphQL endpoints work (or more accurately, don't) with pagination.

Secondly, it puts this list on the project security dashboard and paves the way for the other dashboards. The dashboard itself is basically just the list at this point but it's behind a feature flag and will be updated with the other missing elements before this flag is turned on.

Screenshots

first_class_dashboard

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](https://docs.gitlab.com/ee/development/contributing/merge_request_workflow.html#definition-of-done

touches #210336 (closed)