Revert "Add build-official-release.sh"

This reverts commit d64c818744.

The push-*.sh scripts were broken due to TAR not being defined.

build/push-official-release.sh

@@ -39,10 +39,5 @@ KUBE_GCS_LATEST_CONTENTS=${KUBE_RELEASE_VERSION}
 KUBE_ROOT=$(dirname "${BASH_SOURCE}")/..
 source "$KUBE_ROOT/build/common.sh"
 
-if ${KUBE_ROOT}/cluster/kubectl.sh version | grep Client | grep dirty; then
-  echo "!!! Tag at invalid point, or something else is bad. Build is dirty. Don't push this build." >&2
-  exit 1
-fi
-
 kube::release::gcs::release
 kube::release::gcs::publish_latest_official