🐛 Webhook: Handle http.NoBody

[inteon]

Add handling of http.NoBody.

Depends on #2604.

Code is based on https://github.com/kubernetes/kubernetes/blob/c28c2009181fcc44c5f6b47e10e62dacf53e4da0/staging/src/k8s.io/pod-security-admission/cmd/webhook/server/server.go

[alvaroaleman]

http.NoBody is go-doced as:

It can be used in an outgoing client request to explicitly signal that a request has zero bytes.

How would this ever be set in an incoming request?

[inteon]

http.NoBody is go-doced as:

It can be used in an outgoing client request to explicitly signal that a request has zero bytes.

How would this ever be set in an incoming request?

Upstream the change is explained as follows: kubernetes/kubernetes#115908
That PR refers to the docs here: https://pkg.go.dev/net/http#Request

[k8s-ci-robot]

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This pull-request has been approved by: alvaroaleman, inteon

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