Add sorting based on project star as default sort for CI components

What does this MR do and why?

Adds default sorting based on star count for catalog resources.

Adds spec for the sorting ability in the model.

MR acceptance checklist

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Screenshots or screen recordings

How to set up and validate locally

1. Seed the db with catalog resources using bundle exec rake "gitlab:seed:ci_catalog_resources[Flightjs, 12, true]". This adds 12 components.
2. Update stars for the projects associated with these resources using the below short script, which you can run in the rails console.

p_ids=Ci::Catalog::Resource.all.pluck(:project_id)
p_ids.each do |p_id|
  p = Project.find_by(id: p_id)
  p.star_count = rand(100)
  p.save!
end

This will update the projects with random star counts between 0 to 100.

3. Go to /explore/catalog on your local gdk and see the resources sorted in descending order by star count.

Related to #437897 (closed)