Expose active parameter to Groups GQL API

Expose the active parameter added in #525632 (closed) to the Groups GQL API

Implementation Guide

1. In app/graphql/resolvers/groups_resolver.rb, add active as a new argument:

    argument :active, GraphQL::Types::Boolean,
      required: false,
      description: 'Filter by groups that are not archived and not marked for deletion.'

2. Run bundle exec rake gitlab:graphql:compile_docs to update the documentation.
3. Add the necessary tests in groups_resolver_spec.rb.