Fill out fields on InputType

What does this MR do and why?

CI inputs have more configuration options than are currently available on the GraphQL InputType. This commit adds description, regex, and type fields to make more of the configuration option values available.

It does not add an options field because the value for options is a mix of types, which is not easy to represent in GraphQL.

Changelog: added

Issue: #466669 (closed)

Screenshots or screen recordings

GraphQL Query	Response