Convert health check endpoint controller spec to request spec (#31565)

spec/controllers/health_controller_spec.rb

@@ -1,14 +0,0 @@
-# frozen_string_literal: true
-
-require 'rails_helper'
-
-describe HealthController do
-  render_views
-
-  describe 'GET #show' do
-    it 'returns http success' do
-      get :show
-      expect(response).to have_http_status(200)
-    end
-  end
-end