Out-of-the-box support for TrainJob

[ram4444]

Pull Request Template for Kubeflow Manifests

✏️ Summary of Changes

Describe the changes you have made, including any refactoring or feature additions.

Adding TrainJob support to Katib Trial Templates

📦 Dependencies

List any dependencies or related PRs (e.g., "Depends on #123").

🐛 Related Issues

Link any issues that are resolved or affected by this PR.

✅ Contributor Checklist

• I have tested these changes with kustomize. See Installation Prerequisites.
• All commits are signed-off to satisfy the DCO check.
• I have considered adding my company to the adopters page to support Kubeflow and help the community, since I expect help from the community for my issue (see 1. and 2.).

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[juliusvonkohout]

@ram4444 you need to sign you commits to fix the DCO test and please show me that this is already upstream.

[juliusvonkohout]

/ok-to-test

[google-oss-prow]

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