Create new page for feature gates that were removed

[tengqm]

As the upstream code evolves, many feature gates (deprecated or GA'ed) are removed. That means they are no longer recognized by the Kubernetes components. This PR moves such feature gates into a dedicated page for reference so that we won't bother revisit them again for future releases.

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[kbhawkey]

👀

[sftim]

This seems reasonable. Should we discuss this change (issue? fortnightly Zoom call?) before we make it?

[reylejano]

Preview of updated page:
https://deploy-preview-36876--kubernetes-io-main-staging.netlify.app/docs/reference/command-line-tools-reference/feature-gates/
Preview of new page:
https://deploy-preview-36876--kubernetes-io-main-staging.netlify.app/docs/reference/command-line-tools-reference/feature-gates-removed/

I like the changes proposed in this pull request
Both alpha / beta and graduated / deprecated tables are very large.
Having a separate page for removed feature gates makes sense to me.

In a follow-up PR, I suggest updating the following from this page https://kubernetes.io/docs/contribute/new-content/new-features/#pr-ready-for-review

If your feature is GA'ed or deprecated, make sure to move it from that table to Feature gates for graduated or deprecated features table with Alpha and Beta history intact.

/label refactor

[sftim]

This seems reasonable. Should we discuss this change (issue? fortnightly Zoom call?) before we make it?

A while has passed. I'm happy to approve this split.

/approve

[k8s-ci-robot]

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[natalisucks]

Another happy approver has entered the thread 😸 thanks Qiming! And thanks to Rey and Tim for their own reviews and thoughts.
/lgtm

[k8s-ci-robot]

LGTM label has been added.

Git tree hash: 79af5209e33a0c021dea95b4c3fca6882389a2c8

[reylejano]

In a follow-up PR, I suggest updating the following from this page https://kubernetes.io/docs/contribute/new-content/new-features/#pr-ready-for-review

If your feature is GA'ed or deprecated, make sure to move it from that table to Feature gates for graduated or deprecated features table with Alpha and Beta history intact.

Created follow-up PR #37153