Add packagesCount to project and group type

What does this MR do and why?

This MR adds packagesCount to the project and group types in the GraphQL api

Screenshots or screen recordings

How to set up and validate locally

Try it in the graphiql-explorer

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 #330846 (closed)