feat: add validation for ReplicatedJobPatch name

[pulkit-999]

• Add CEL/XValidation rule for ReplicatedJobPatch.name.
• Add integration tests for replicated job name validation.

This prevents invalid replicated job identifiers from being accepted into the API and aligns validation behavior with existing Kubernetes CRD validation conventions.

[google-oss-prow]

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[Copilot]

Pull request overview

Adds a CEL XValidation rule on ReplicatedJobPatch.name to enforce an RFC 1035-style DNS label pattern, regenerates the CRD manifests, and adds integration tests covering valid and invalid names.

Changes:

• Add XValidation rule with regex ^[a-z0-9]([-a-z0-9]*[a-z0-9])?$ and message on ReplicatedJobPatch.Name.
• Regenerate x-kubernetes-validations entries in both base and Helm chart CRDs.
• Add positive and negative integration test cases for replicated job name validation.

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 1 comment.

File	Description
pkg/apis/trainer/v1alpha1/trainjob_types.go	Adds the CEL XValidation marker to ReplicatedJobPatch.Name.
manifests/base/crds/trainer.kubeflow.org_trainjobs.yaml	Generated CRD update reflecting the new validation.
charts/kubeflow-trainer/crds/trainer.kubeflow.org_trainjobs.yaml	Generated Helm chart CRD update reflecting the new validation.
test/integration/webhooks/trainjob_test.go	Adds integration test entries for invalid/valid replicated job names.

[Copilot]

Pull request overview

Copilot reviewed 4 out of 4 changed files in this pull request and generated no new comments.