Add statistics seats card

What does this MR do and why?

It adds StatisticsSeatsCard, that will be used in !82399 (merged).

Screenshots or screen recordings

How to set up and validate locally

• Run yarn storybook:start
• Navigate to http://localhost:9002/?path=/story/usage-quotas-components-statistics-seats-card--default

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 #350788 (closed)