KEP-4420: Retry Generate Name: Promote to beta

[jpbetz]

This is not a user visible feature. The change is that name generation is retried automatically by the apiserver if the randomly generated hash collides an existing name. Name generation failures can still happen, and happen with the same error, but are far more rare.

For this reason, only a feature gate is being added to the documentation.

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[T-Lakshmi]

Changes looks fine to me.
/lgtm

[k8s-ci-robot]

LGTM label has been added.

Git tree hash: e8109365e486413b54780c6b46a2690261cd1eee

[T-Lakshmi]

Here is the Preview page.

[sftim]

/approve

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