[QA] Make sure we wait for the deploy key list to load

Signed-off-by: Rémy Coutable <remy@rymai.me>

qa/qa/page/project/settings/deploy_keys.rb

@@ -57,6 +57,10 @@ module QA
           private
 
           def within_project_deploy_keys
+            wait(reload: false) do
+              find_element(:project_deploy_keys)
+            end
+
             within_element(:project_deploy_keys) do
               yield
             end