Fix race condition in auto devops QA spec: ensure we wait for Install button to appear

qa/qa/page/project/operations/kubernetes/show.rb

@@ -16,6 +16,7 @@ module QA
 
             def install!(application_name)
               within(".js-cluster-application-row-#{application_name}") do
+                page.has_button?('Install', wait: 30)
                 click_on 'Install'
               end
             end

spec/features/projects/clusters/applications_spec.rb

@@ -121,8 +121,9 @@ describe 'Clusters Applications', :js do
 
   def wait_until_helm_created!
     retries = 0
-    while Clusters::Cluster.last.application_helm.nil? do
+    while Clusters::Cluster.last.application_helm.nil?
       raise "Timed out waiting for helm application to be created in DB" if (retries += 1) > 3
+
       sleep(1)
     end
   end