Automatic merge from submit-queue (batch tested with PRs 37860, 38429, 38451, 36050, 38463)

Stop generating openapi spec for internal types

Extracted from https://github.com/kubernetes/kubernetes/pull/38406

I don't think we should be generating openapi specs for the internal types, since they are never intended to be interacted with via the API. #38406 makes that very clear by removing the json tags, at which point the openapi spec field names mimic the go structs