Automatic merge from submit-queue (batch tested with PRs 36816, 37534)

Move pkg/api/unversioned to pkg/apis/meta/v1

This moves code from using pkg/api/unversioned to pkg/apis/meta/v1 with the `metav1` local package name.

Built on top of #37532 (the first three commits related to ExportOptions)

Part of #37530