[Ansible::Runner] wait on artifacts/ to exist

Before returning a result, wait on the `artifacts/` directory to be
created before returning a response object.

This will ensure that calling `.running?` will return `false` properly
when the `ansible-runner` has ended, and not before it has even had a
chance to start.

Thanks for Jason for the find on this bug.

lib/ansible/runner.rb

@@ -217,6 +217,7 @@ def run_via_cli(hosts, credentials, env_vars, extra_vars, tags: nil, ansible_run
         begin
           fetch_galaxy_roles(playbook_or_role_args)
           result = AwesomeSpawn.run("ansible-runner", :env => env_vars_hash, :params => params)
+          wait_on(File.join(base_dir, "artifacts"))
           res = response(base_dir, ansible_runner_method, result)
         ensure
           # Clean up the tmp dir for the sync method, for async we will clean it up after the job is finished and we've
@@ -377,6 +378,13 @@ def python3_modules_path
       def determine_existing_python_paths_for(*paths)
         paths.select { |path| File.exist?(path) }
       end
+
+      def wait_on(dir)
+        100.times do
+          Dir.exists?(dir)
+          sleep(0.1)
+        end
+      end
     end
   end
 end