Remove runner list in group settings

This change expands on the implementation of the group runners list by
removing the old list implementation.

When `runner_list_group_view_vue_ui` is disabled, the old runner list
is still available, but it pending for full removal.

Changelog: removed

app/views/groups/runners/_settings.html.haml

 - if Feature.enabled?(:runner_list_group_view_vue_ui, @group, default_enabled: :yaml)
+  .gl-mb-6
+    #update-shared-runners-form{ data: group_shared_runners_settings_data(@group) }
   .gl-card.gl-px-8.gl-py-6.gl-line-height-20
     .gl-card-body.gl-display-flex{ :class => "gl-p-0!" }
       .gl-banner-illustration
@@ -11,22 +13,22 @@
         %a.btn.btn-confirm.btn-md.gl-button{ :href => group_runners_path(@group) }
           %span.gl-button-text
           = s_('Runners|Take me there!')
+- else
+  = render 'shared/runners/runner_description'
 
-= render 'shared/runners/runner_description'
-
-%hr
+  %hr
 
-.row
+  .row
     .col-sm-6
       = render 'groups/runners/group_runners'
     .col-sm-6
       = render 'groups/runners/shared_runners'
 
-%h4.underlined-title
+  %h4.underlined-title
     = _('Available runners: %{runners}').html_safe % { runners: limited_counter_with_delimiter(@all_group_runners) }
 
--# haml-lint:disable NoPlainNodes
-.row
+  -# haml-lint:disable NoPlainNodes
+  .row
     .col-sm-9
       = form_tag group_settings_ci_cd_path, id: 'runners-search', method: :get, class: 'filter-form js-filter-form' do
         .filtered-search-wrapper.d-flex
@@ -95,7 +97,7 @@
       = _('Runners currently online: %{active_runners_count}') % { active_runners_count: limited_counter_with_delimiter(@all_group_runners.online) }
 
 
-- if @group_runners.any?
+  - if @group_runners.any?
     .content-list{ data: { testid: 'runners-table' } }
       .table-holder
         .gl-responsive-table-row.table-row-header{ role: 'row' }
@@ -113,5 +115,5 @@
           - runner = runner.present(current_user: current_user)
           = render 'groups/runners/runner', runner: runner
       = paginate @group_runners, theme: 'gitlab', :params => { :anchor => 'runners-settings' }
-- else
+  - else
     .nothing-here-block= _('No runners found')

spec/features/groups/settings/ci_cd_spec.rb

@@ -5,40 +5,59 @@ require 'spec_helper'
 RSpec.describe 'Group CI/CD settings' do
   include WaitForRequests
 
-  let(:user) { create(:user) }
-  let(:group) { create(:group) }
+  let_it_be(:user) { create(:user) }
+  let_it_be(:group, reload: true) { create(:group) }
 
-  before do
+  before_all do
     group.add_owner(user)
+  end
+
+  before do
     sign_in(user)
   end
 
-  describe 'new group runners view banner' do
-    it 'displays banner' do
+  describe 'Runners section' do
+    let(:shared_runners_toggle) { page.find('[data-testid="enable-runners-toggle"]') }
+
+    context 'with runner_list_group_view_vue_ui enabled' do
+      before do
         visit group_settings_ci_cd_path(group)
+      end
 
+      it 'displays the new group runners view banner' do
         expect(page).to have_content(s_('Runners|New group runners view'))
         expect(page).to have_link(href: group_runners_path(group))
       end
 
-    it 'does not display banner' do
+      it 'has "Enable shared runners for this group" toggle', :js do
+        expect(shared_runners_toggle).to have_content(_('Enable shared runners for this group'))
+      end
+    end
+
+    context 'with runner_list_group_view_vue_ui disabled' do
+      before do
         stub_feature_flags(runner_list_group_view_vue_ui: false)
 
         visit group_settings_ci_cd_path(group)
+      end
 
+      it 'does not display the new group runners view banner' do
         expect(page).not_to have_content(s_('Runners|New group runners view'))
         expect(page).not_to have_link(href: group_runners_path(group))
       end
+
+      it 'has "Enable shared runners for this group" toggle', :js do
+        expect(shared_runners_toggle).to have_content(_('Enable shared runners for this group'))
       end
 
-  describe 'runners registration token' do
+      context 'with runners registration token' do
         let!(:token) { group.runners_token }
 
         before do
           visit group_settings_ci_cd_path(group)
         end
 
-    it 'has a registration token' do
+        it 'displays the registration token' do
           expect(page.find('#registration_token')).to have_content(token)
         end
 
@@ -49,11 +68,13 @@ RSpec.describe 'Group CI/CD settings' do
             click_button 'Reset registration token'
           end
 
-      it 'changes registration token' do
+          it 'changes the registration token' do
             expect(page_token).not_to eq token
           end
         end
       end
+    end
+  end
 
   describe 'Auto DevOps form' do
     before do

spec/features/runners_spec.rb

@@ -352,6 +352,7 @@ RSpec.describe 'Runners' do
 
     before do
       group.add_owner(user)
+      stub_feature_flags(runner_list_group_view_vue_ui: false)
     end
 
     context 'group with no runners' do