kubernetes/gke: skip API tests in short mode
kubernetes/gke: skip API tests in short mode

Updates golang/go#30612

Change-Id: I752c57f8631025f1784951e701340d2c21ee277c
Reviewed-on: https://go-review.googlesource.com/c/build/+/165777
Reviewed-by: Bryan C. Mills <1c8aad60184261ccede67f5c63a0d2a3bf3c9ff4@google.com>

golang/build,golang/build,golang/build,golang/build