Follow-up from "Add ability to query single Terraform State" - Validate Terraform Name

The following discussion from !51145 (merged) should be addressed:

• @emilyring started a discussion: (+2 comments)

  @tigerwnz @dgruzd could you review this MR?

  @tigerwnz The Terraform::State model is missing validates :name 🤔 Looking at some of the other code, I think this was intentional. I just wanted to confirm. Thanks!