prototype ACME delayed challenge acceptance guidance

[wallrj]

Preview:

• https://deploy-preview-2101--cert-manager.netlify.app/docs/configuration/acme/#optional-delayed-acceptance-when-self-check-cannot-succeed
• https://deploy-preview-2101--cert-manager.netlify.app/docs/troubleshooting/acme/#http01-troubleshooting

Summary

This draft PR documents the proposed ACME acceptChallengeAfter solver option for the next minor cert-manager release.

It is documentation for the code proposal in cert-manager/cert-manager#8794, which is itself a simpler follow-up to the earlier closed attempt in cert-manager/cert-manager#5006.

The docs explain:

• what problem this is trying to solve;
• when the option may be useful;
• the intended behaviour;
• an example Issuer / ClusterIssuer configuration; and
• how this fits into ACME troubleshooting.

TODO

• keep the docs aligned with maintainer feedback on the final field name and API shape
• decide whether the final docs should mention both HTTP01 and DNS01 examples
• remove prototype wording once the API is agreed
• merge only when the corresponding cert-manager feature is accepted for the next minor release

Part of cert-manager/cert-manager#1292.

Cross-reference: cert-manager/cert-manager#8794.

[cert-manager-prow]

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