Remove unused group links route

- not used except by a test...

app/controllers/projects/group_links_controller.rb

@@ -5,10 +5,6 @@ class Projects::GroupLinksController < Projects::ApplicationController
   before_action :authorize_admin_project!
   before_action :authorize_admin_project_member!, only: [:update]
 
-  def index
-    redirect_to namespace_project_project_members_path
-  end
-
   def create
     group = Group.find(params[:link_group_id]) if params[:link_group_id].present?
 

config/routes/group.rb

@@ -78,7 +78,7 @@ constraints(::Constraints::GroupUrlConstrainer.new) do
       delete :leave, on: :collection
     end
 
-    resources :group_links, only: [:index, :create, :update, :destroy], constraints: { id: /\d+/ }
+    resources :group_links, only: [:create, :update, :destroy], constraints: { id: /\d+/ }
 
     resources :uploads, only: [:create] do
       collection do

config/routes/project.rb

@@ -199,7 +199,7 @@ constraints(::Constraints::ProjectUrlConstrainer.new) do
 
         resources :starrers, only: [:index]
         resources :forks, only: [:index, :new, :create]
-        resources :group_links, only: [:index, :create, :update, :destroy], constraints: { id: /\d+/ }
+        resources :group_links, only: [:create, :update, :destroy], constraints: { id: /\d+/ }
 
         resource :import, only: [:new, :create, :show]
         resource :avatar, only: [:show, :destroy]

spec/features/projects/members/invite_group_spec.rb

@@ -39,6 +39,8 @@ describe 'Project > Members > Invite group', :js do
         it 'the project can be shared with another group' do
           visit project_project_members_path(project)
 
+          expect(page).not_to have_css('.project-members-groups')
+
           click_on 'invite-group-tab'
 
           select2 group_to_share_with.id, from: '#link_group_id'

spec/features/projects/settings/user_manages_group_links_spec.rb

-# frozen_string_literal: true
-
-require 'spec_helper'
-
-describe 'Projects > Settings > User manages group links' do
-  include Select2Helper
-
-  let(:user) { create(:user) }
-  let(:project) { create(:project, namespace: user.namespace) }
-  let(:group_ops) { create(:group, name: 'Ops') }
-  let(:group_market) { create(:group, name: 'Market', path: 'market') }
-
-  before do
-    project.add_maintainer(user)
-    group_market.add_guest(user)
-    sign_in(user)
-
-    share_link = project.project_group_links.new(group_access: Gitlab::Access::MAINTAINER)
-    share_link.group_id = group_ops.id
-    share_link.save!
-
-    visit(project_group_links_path(project))
-  end
-
-  it 'shows a list of groups' do
-    page.within('.project-members-groups') do
-      expect(page).to have_content('Ops')
-      expect(page).not_to have_content('Market')
-    end
-  end
-
-  it 'invites a group to a project', :js do
-    click_link('Invite group')
-
-    select2(group_market.id, from: '#link_group_id')
-    select('Maintainer', from: 'link_group_access')
-
-    click_button('Invite')
-
-    page.within('.project-members-groups') do
-      expect(page).to have_content('Market')
-    end
-  end
-end