Support validating pipeline template in validator UI

[VonnyJap]

What happened: Pipeline template is a new feature so there is no support in the validator UI to show the expanded config from the template in the ValidatorResults.

What you expected to happen: Make required changes to render the pipeline template config in the ValidatorResults.

How to reproduce it:

Use this example https://github.com/screwdriver-cd-test/pipeline-template-example/blob/master/sd-template.yaml and paste into validator. Jobs and steps are not rendered as expected.