Reduce VPA mutating webhook timeout from 30s to 10s

[dharmab]

Fixes #2762

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[dharmab]

/assign @jbartosik

[dharmab]

/assign @bskiba

[dharmab]

A follow-up PR could make this timeout configurable, but reducing the timeout from the default 30s to the much saner 10s is an improvement and reflects the change in default between the admissionregistration.k8s.io/v1beta1 and admissionregistration.k8s.io/v1 types.

[bskiba]

Can we make it a flag?

[dharmab]

I've decided to close this in favor of using #2949 instead.