Add package list graphql endpoint

Add a new graphql package list GraphQL endpoint, to allow
Package data to be consumed with graphql, this is a first
Step to boost the ability of the backend to serve complete
And performant data

- resolver
- unit tests
- package type
- alter project type
Co-authored-by: Tetiana Chupryna <tchupryna@gitlab.com>
Co-authored-by: David Fernandez <dfernandez@gitlab.com>
Co-authored-by: Nick Kipling <nkipling@gitlab.com>
Co-authored-by: Steve Abrams <sabrams@gitlab.com>

Add new packages type to project type

- project type change
- unit test
Co-authored-by: Tetiana Chupryna <tchupryna@gitlab.com>
Co-authored-by: David Fernandez <dfernandez@gitlab.com>
Co-authored-by: Nick Kipling <nkipling@gitlab.com>
Co-authored-by: Steve Abrams <sabrams@gitlab.com>

ee/app/graphql/ee/types/project_type.rb

@@ -42,6 +42,10 @@ module EE
                 Hash.new(0).merge(project.requirements.counts_by_state)
               end
 
+        field :packages, ::Types::PackageType.connection_type, null: true,
+              description: 'Packages of the project',
+              resolver: ::Resolvers::PackagesResolver
+
         def self.requirements_available?(project, user)
           ::Feature.enabled?(:requirements_management, project, default_enabled: true) && Ability.allowed?(user, :read_requirement, project)
         end

ee/app/graphql/resolvers/packages_resolver.rb

+# frozen_string_literal: true
+
+module Resolvers
+  class PackagesResolver < BaseResolver
+    type Types::PackageType, null: true
+
+    def resolve(**args)
+      return unless packages_available?(object, current_user)
+      ::Packages::PackagesFinder.new(object).execute
+    end
+
+    private
+
+    def packages_available?(object, user)
+      ::Gitlab.config.packages.enabled && object.feature_available?(:packages) && Ability.allowed?(user, :read_package, object)
+    end
+  end
+end
+  
\ No newline at end of file

ee/spec/graphql/resolvers/packages_resolver_spec.rb

+# frozen_string_literal: true
+
+require 'spec_helper'
+
+describe Resolvers::PackagesResolver do
+  include GraphqlHelpers
+
+  let_it_be(:user) { create(:user) }
+  let_it_be(:project) { create(:project) }
+  let_it_be(:package) { create(:package, project: project) }
+
+ 
+  describe '#resolve' do
+    subject(:packages) { resolve(described_class, ctx: { current_user: user }, obj: project) }
+
+    context 'when the package feature is enabled' do
+      before do
+        stub_licensed_features(packages: true)
+      end
+
+      context 'when the project has the package feature enabled' do
+        before do
+          allow(project).to receive(:feature_available?).with(:packages).and_return(true)
+        end
+
+        context 'when the user is authorized to read the packages' do
+          before do
+            project.add_reporter(user)
+          end
+
+          it { is_expected.to contain_exactly(package) }
+        end
+        
+        context 'when the user is not authorized to read the package' do
+          it { is_expected.to be_nil }
+        end
+      end
+
+      context 'when the project has the package feature disabled' do
+        before do
+          allow(project).to receive(:feature_available?).with(:packages).and_return(false)
+        end
+
+        it { is_expected.to be_nil }
+      end
+    end
+
+    context 'when the package feature is not enabled' do
+      it { is_expected.to be_nil }
+    end
+  end
+
+end

ee/spec/graphql/types/project_type_spec.rb

@@ -16,7 +16,7 @@ describe GitlabSchema.types['Project'] do
   it 'includes the ee specific fields' do
     expected_fields = %w[
       service_desk_enabled service_desk_address vulnerabilities
-      requirement_states_count vulnerability_severities_count
+      requirement_states_count vulnerability_severities_count packages
     ]
 
     expect(described_class).to include_graphql_fields(*expected_fields)