Pipeline Template JSON Schema versions

[JC-wk]

Description

I was just looking in to the differences within the JSON Schema and I could not see anywhere in the TRE Docs what schema are supported. We seem to be using Draft 07 in the templates are
"$schema": "http://json-schema.org/draft-07/schema",
yet there are properties in the template that are newer such as unevaluatedProperties
api_app/models/domain/resource_template.py

I think there needs to be documented standards around this and the templates may need updating to suit