This PR kills the verifications infrastructure which is no longer used.
It was relocated to the `llama-stack-evals`
(https://github.com/meta-llama/llama-stack-evals) repository previously.
Responses tests used this infrastructure but that wasn't quite
necessary, just a little useful back when @bbrownin introduced the
tests. On Discord, we agreed that tests can be moved to our regular
integrations test infra.
## Test Plan
Some tests currently do fail (although they run!) I will send a
follow-up PR which makes them all pass.
