Add GraphQL fields `star_count` `forks_count` to CiCatalogResource

What does this MR do and why?

Added star_count and forks_count fields to ciCatalogResource in GraphQL. Utilized the existing methods from ProjectType.

Note that project.forks_count is a method that already uses Batch loading. We just need to wrap it for GraphQL.

Partially resolves #407382 (closed)

How to set up and validate locally

1. In the Rails console, run Feature.enable(:ci_private_catalog_beta) and Feature.enable(:ci_namespace_catalog_experimental).
2. Create a Catalog Resource with an existing or new Project:

::Ci::Catalog::Resource.create(project: Project.find(<project_id>))

3. Star (aka "Favorite") and fork your Project.
4. Go to http://gdk.test:3000/-/graphql-explorer and run the following query (adjust the projectPath as necessary):

query getCiCatalogResources {
  ciCatalogResources(projectPath: "group-a/project-catalog-resource-1") {
    nodes {
      id
      name
      starCount
      forksCount
    }
  }
}

5. Observe that the output shows the Catalog Resource data with the correct star and forks count.

Screenshot

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 #407382 (closed)