Handle assertions and errors thrown in `before_each` and `after_each`

[MisanthropicBit]

Throwing errors in a before_each won't generate a neotestPositionId. This is probably because we only handle the testEnd event in the output handler and not the describeEnd event since the names in the output json look like "... before_each".

We need to make sure to generate position ids for this and fail the entire namespace by stripping before_each/after_each from the position.