Invalid validation on Network field

[ahg-g]

When not set, validation fails when creating a JobSet, I think something is wrong with the CEL validation at https://github.com/kubernetes-sigs/jobset/blob/main/api/v1alpha1/jobset_types.go#L83

Probably better to move this to the validation webhook, that validation line is hard to reason about.

/kind bug

[tenzen-y]

Creating the integration tests for validation webhook might be worth it to avoid such bugs.

[ahg-g]

Yup, we have validation tests, but clearly not enough coverage.

[kannon92]

#63 I believe solves this issue.

/close

[k8s-ci-robot]

@kannon92: Closing this issue.

In response to this:

#63 I believe solves this issue.

/close

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