Document ways to avoid users submitting workloads without any requests

[kannon92]

What would you like to be added:
We should add a doc to explain how to use ValidationAdmissionPolicy to optionally forbid users from submitting workloads without any requests.

This page should be updated to mention how one can use VAP to enforce workloads having requests.

Why is this needed:

Kueue tracks resource requests by the requests field in the PodTemplate. If one submits a workload without any requests specified, kueue will not report any resources used by this workload.

It would be worth mentioning this in the docs and provide an example to forbid this.
Completion requirements:

This enhancement requires the following artifacts:

• Design doc
• API change
• Docs update

The artifacts should be linked in subsequent comments.

[kannon92]

/remove-kind feature
/kind docs
/help
/good-first-issue

[k8s-ci-robot]

@kannon92:
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In response to this:

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[k8s-ci-robot]

@kannon92: The label(s) kind/docs cannot be applied, because the repository doesn't have them.

In response to this:

/remove-kind feature
/kind docs
/help
/good-first-issue

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes-sigs/prow repository.

[tenzen-y]

/kind documentation

[amitmaurya07]

Hi, I would like to work on this issue. Could you please assign this issue to me?

[mbobrovskyi]

/assign @amitmaurya07