Add test cases for CVS metrics

What does this MR do and why?

Add test cases for recently added matrices as a part of Essential metrics for CVS on advisory DB change (#424229 - closed)

Add test cases

Add test case for counter

MR acceptance checklist

This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.

• I have evaluated the MR acceptance checklist for this MR.

Related to #429052 (closed)