Merge pull request #67157 from dims/drop-kube-aggregator-container-image-from-release

Automatic merge from submit-queue (batch tested with PRs 66177, 66185, 67136, 67157, 65065). If you want to cherry-pick this change to another branch, please follow the instructions <a href="https://github.com/kubernetes/community/blob/master/contributors/devel/cherry-picks.md">here</a>.

Drop kube-aggregator container image from release

**What this PR does / why we need it**:

First version of this was only standalone, now the code is integrated into kube-apiserver. So the standalone binary and
container are no longer useful.

Change-Id: Ib9369de66b4ecb3451f73ba2a252526d6615b96f


**Which issue(s) this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close the issue(s) when PR gets merged)*:
Fixes #

**Special notes for your reviewer**:

**Release note**:

```release-note
Remove unused binary and container image for kube-aggregator. The functionality is already integrated into the kube-apiserver.
```

hack/lib/golang.sh

@@ -30,7 +30,6 @@ kube::golang::server_targets() {
     cmd/kubeadm
     cmd/hyperkube
     cmd/kube-scheduler
-    vendor/k8s.io/kube-aggregator
     vendor/k8s.io/apiextensions-apiserver
     cluster/gce/gci/mounter
   )
@@ -208,7 +207,6 @@ readonly KUBE_STATIC_LIBRARIES=(
   kube-controller-manager
   kube-scheduler
   kube-proxy
-  kube-aggregator
   kubeadm
   kubectl
 )