docs(container): Operation.Type is now documented in detail (#7811)

- [ ] Regenerate this pull request now.

docs: Operation.self_link and Operation.target_link given examples
feat: Cluster resizes will now have their own operation type (RESIZE_CLUSTER) instead of reusing REPAIR_CLUSTER; they will start using this in the near future

PiperOrigin-RevId: 526025502

Source-Link: https://togithub.com/googleapis/googleapis/commit/427318085badbe1714eb7e77f91ee4cb1911ffbb

Source-Link: https://togithub.com/googleapis/googleapis-gen/commit/772e2cd48f561e1f0a4d172e9f9285ad9e1c1210
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