Automatic merge from submit-queue (batch tested with PRs 45057, 47259)
Allow conversion-gen to take types that are not in the output path
Part of fixing https://github.com/kubernetes/kubernetes/issues/44065.
Partially address https://github.com/kubernetes/features/issues/282.
The first commit is the changes to the conversion-gen (and vendor).
The second commit moves the api/v1 types to staging, and the third commit shows the resulted changes in the generated conversions.
e1efc5465d