docs: add guide on enforcing resource requests with VAP

[TapanManu]

This adds a new section to the admission policy documentation explaining how to use ValidatingAdmissionPolicy to reject workloads without resource requests or limits.

Fixes #3069

What type of PR is this?

/kind documentation

What this PR does / why we need it:

Documentation to avoid users submitting workloads with empty requests to the namespaces managed by kueue with the help of a VAP.

Which issue(s) this PR fixes:

Fixes #3069

Special notes for your reviewer:

Does this PR introduce a user-facing change?

None

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[kannon92]

I don't think this VAP would work.

You need VAP to enforce these policies in the workloads that users submit (Job, Deployment , etc)