prune .import-restrictions

specifically:

- cmd/kubeadm/.import-restrictions
  - we don't need to explicitly allow k8s.io repos (external or published)
- rm pkg/controller/.import-restrictions
  - pkg/client/unversioned was removed in 59042
- pkg/kubectl/.import-restrictions
  - pkg/printers is no longer used
  - pkg/api was masking all of the pkg/apis prefixes
- rm staging/src/k8s.io/code-generator/cmd/lister-gen/.import-restrictions
  - noop / empty file
- test/e2e/framework/.import-restrictions
  - we don't need to explicitly allow k8s.io repos (external or published)

test/e2e/framework/.import-restrictions

@@ -263,28 +263,3 @@ rules:
   - selectorRegexp: k8s[.]io/kubernetes/third_party/
     allowedPrefixes:
     - k8s.io/kubernetes/third_party/forked/golang/expansion
-  # Allow import of specific parts of k8s.io/utils
-  # TODO: why wouldn't we just allow all of k8s.io/utils
-  - selectorRegexp: k8s[.]io/utils/
-    allowedPrefixes:
-      - k8s.io/utils/buffer
-      - k8s.io/utils/exec
-      - k8s.io/utils/inotify
-      - k8s.io/utils/integer
-      - k8s.io/utils/io
-      - k8s.io/utils/keymutex
-      - k8s.io/utils/mount
-      - k8s.io/utils/net
-      - k8s.io/utils/nsenter
-      - k8s.io/utils/path
-      - k8s.io/utils/pointer
-      - k8s.io/utils/strings
-      - k8s.io/utils/trace
-  # Allow import of k8.io/(api|apimachinery|apiextensions-apiserver|apiserver)
-  - selectorRegexp: k8s[.]io/(api/|apimachinery/|apiextensions-apiserver/|apiserver/)
-    allowedPrefixes:
-      - ''
-  # Allow import of ks.io/client-go
-  - selectorRegexp: k8s[.]io/client-go/
-    allowedPrefixes:
-      - ''