KEP-1645: Update MCS API graduation criteria based on 5/11 SIG-MC discussions

[lauralorenz]

• One-line PR description: Update graduation criteria based on 5/11 SIG-MC discussions

• Issue link: Multi-Cluster Services API #1645

• Other comments:

  • Removed kube-proxy implementation related items (now consider these an implementation detail0
  • Explicitly tied MCS API to Cluster ID KEP's maturity level
  • Based on conversation on 5/11 SIG-MC meeting, see slides (notes in speaker notes) and meeting recording starting at 7:20

TODO

• mention a few examples of implementations (dummy service, if you made kubeproxy work with it, your own thing)

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/lifecycle stale

[lauralorenz]

/remove-lifecycle stale

[lauralorenz]

/assign jeremyot

[JeremyOT]

/lgtm
/approve

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[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: JeremyOT, lauralorenz

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