Better to create events when failed to deploy the job by jobset

[zhouying7780]

What would you like to be added:
Better to create events when failed to deploy the job by jobset

Why is this needed:
failed to create the worker job, but no events , check the jobset-controller-manager , could see logs :
2025-09-05T11:27:55Z ERROR Reconciler error {"controller": "jobset", "controllerGroup": "jobset.x-k8s.io", "controllerKind": "JobSet", "JobSet": {"name":"success-policy","namespace":"zhouy"}, "namespace": "zhouy", "name": "success-policy", "reconcileID": "0b09ae51-1cd2-4c31-a908-87d0bee067a8", "error": "job "success-policy-workers-0" creation failed with error: Job.batch "success-policy-workers-0" is invalid: spec.completions: Required value: when completion mode is Indexed"}sigs.k8s.io/controller-runtime/pkg/internal/controller.(*Controller[...]).reconcileHandler /workspace/vendor/sigs.k8s.io/controller-runtime/pkg/internal/controller/controller.go:353sigs.k8s.io/controller-runtime/pkg/internal/controller.(*Controller[...]).processNextWorkItem /workspace/vendor/sigs.k8s.io/controller-runtime/pkg/internal/controller/controller.go:300sigs.k8s.io/controller-runtime/pkg/internal/controller.(*Controller[...]).Start.func2.1 /workspace/vendor/sigs.k8s.io/controller-runtime/pkg/internal/controller/controller.go:202

This enhancement requires the following artifacts:

• Design doc
• API change
• Docs update

The artifacts should be linked in subsequent comments.

[kannon92]

I could see this being valuable. So your proposal would be to add an event in addition to the error logs.

• Run Job validation on the templates as part of JobSet validation #59
• Investigate ways to validate Job templates at JobSet validation time #422

We have a long standing issue where we don't do validation of the Job template until it is created.

cc @GiuseppeTT @carreter

Daniel did some research into this but we didn't get very far on this.