Fix approvals UI rendering when feature is disabled

ee/app/views/shared/issuable/_approver_suggestion.haml

@@ -5,7 +5,8 @@
 - approver_presenter = MergeRequestApproverPresenter.new(issuable, skip_user: current_user)
 - show_code_owner_tip = approver_presenter.show_code_owner_tips?
 
-#js-mr-approvals-input{ data: { 'project_id': @target_project.id,
+- if presenter.approval_feature_available?
+  #js-mr-approvals-input{ data: { 'project_id': @target_project.id,
     'can_edit': can?(current_user, :update_approvers, issuable).to_s,
     'can_update_approvers': can_update_approvers.to_s,
     'show_code_owner_tip': show_code_owner_tip.to_s,
@@ -16,4 +17,4 @@
     'eligible_approvers_docs_path': help_page_path('user/project/merge_requests/approvals/rules', anchor: 'eligible-approvers'),
     'project_settings_path': presenter.api_project_approval_settings_path } }
     = sprite_icon('spinner', size: 24, css_class: 'gl-spinner gl-mt-5')
-= render 'projects/merge_requests/code_owner_approval_rules', merge_request: @mr_presenter
+  = render 'projects/merge_requests/code_owner_approval_rules', merge_request: @mr_presenter

ee/spec/features/merge_request/user_edits_approval_rules_mr_spec.rb

@@ -128,4 +128,16 @@ RSpec.describe 'Merge request > User edits MR with approval rules', :js do
       expect(page).to have_selector('.select2-result-label .group-result', text: group.name)
     end
   end
+
+  context 'feature is disabled' do
+    before do
+      stub_licensed_features(merge_request_approvers: false)
+
+      visit(edit_project_merge_request_path(project, merge_request))
+    end
+
+    it 'cannot see the approval rules input' do
+      expect(page).not_to have_content('Approval rules')
+    end
+  end
 end