KEP-5073: PRR update for v1.34

[aaron-prindle]

One-line PR description: This PR explains the work being done in Declarative Validation in v1.34 as part of the PRR process. Related comment here: #5073 (comment)

Issue link: #5073

Summary of Declarative Validation Work In v1.33 and v1.34

"Beta - v1.33"

• validation-gen framework core pieces
• migration of subset of fields from ReplicaSet

"Beta - v1.34"

• ratcheting support ([KEP-5073] Update KEP with section of validation ratcheting #5292)
• cross-field validation support (KEP-5073: Declarative Validation: Explain and update document with cross-field validation information #5290, KEP-5073: Declarative Validation: Explain and update document with cross-field field reference validation information #5363)
• immutability support (KEP-5073: Declarative Validation: Explain and update document with immutability validation information #5373)
• migration of subset of fields of from CertificateSigningRequest

Declarative Validation PRR Information

From the conversation #5073 (comment) with the v1.34 Enhancments team, the below was mentioned:

This is a reminder of the upcoming PRR Freeze on Thursday 12th June 2025.

By this date, there must be a PR open in k/enhancements with:

• The KEP's PRR questionnaire filled out.
  • The PRR readiness review questionnaire was filled out as part of the KEP process in v1.33, nothing has changed w.r.t the PRR questionnaire that was filled out in v1.33: https://github.com/kubernetes/enhancements/blob/master/keps/sig-api-machinery/5073-declarative-validation-with-validation-gen/README.md#production-readiness-review-questionnaire
• (this PR) The kep.yaml updated with the stage, latest-milestone, and milestone struct filled out.
  • This PR updates latest-milestone to v1.34
• A PRR approval file with the PRR approver listed for the stage the KEP is targeting.
  • This was already done for KEP 5073 Beta stage in v1.33: https://github.com/kubernetes/enhancements/blob/master/keps/prod-readiness/sig-api-machinery/5073.yaml

[aaron-prindle]

/cc @rayandas @pohly

[deads2k]

/lgtm
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

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