Add a GraphQL based counts component

What does this MR do?

Creates a Vulnerabilities Counts List component which retrieves data from GraphQL. Right now this component is not used anywhere, but when !27820 (merged) is merged, we can simply substitute our REST based list component with this one.

Screenshots

There should be no visual change but here is the demo: https://youtu.be/A7_LN2nBQ-A

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

Security

If this MR contains changes to processing or storing of credentials or tokens, authorization and authentication methods and other items described in the security review guidelines:

• Label as security and @ mention @gitlab-com/gl-security/appsec
• The MR includes necessary changes to maintain consistency between UI, API, email, or other methods
• Security reports checked/validated by a reviewer from the AppSec team

Demo

Closes #210346 (closed)