Draft: feature: Use terraform test framework to check compatibility with tfe_provider

I was curious if it would be possible to use the terraform test capability to test the compatibility with the tfe provider.

It's possible, although in some places quite frustrating. Especially if you want to check imports too.

I want to see if I can also rewrite the run_tests.sh a little so that it can spin everything up and clean up in a fairly short period of time.