linkerd/linkerd2 edge-21.11.4

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edge-21.11.4

This edge release introduces a change in the destination service to honor
opaque ports set in the proxyProtocol field of Server resources. This
change makes it possible to set opaque ports directly in Server resources
without needing the opaque ports annotation on pods. The release also features
a number of fixes and improvements, a big thank you to our external
contributors for their continued support and involvement.

• Added support in the destination service for honoring opaque ports marked in
  Server resources; ports can now be marked as opaque directly in Server
  resources through the proxyProtocol field.
• Added support to override default behavior and run proxyInit as root
  (thanks @alex-berger!)
• Added multicluster Link CRD to code generation script; consumers of the
  multicluster API can now use a typed API to interact with multicluster links
  (thanks @zaharidichev!)
• Added a multicluster integration test for exported headless services (thanks
  @importhuman!)
• Deprecated v1alpha1 version of the policy APIs
• Removed newline from linkerd check header text (thanks @mikutas!)
• Replaced deprecated beta.kubernetes.io/os label with kubernetes.io/os