Automatic merge from submit-queue (batch tested with PRs 44044, 44766, 44930, 45109, 43301)

add APIService conditions

Adds conditions to the APIServiceStatus struct and fixes up generators that appear to have slipped.

The first condition is "ServiceAvailable" which will provide the status currently derived in the discovery handler that decides about whether to expose the version in discovery.

@kubernetes/sig-api-machinery-pr-reviews @liggitt @ncdc