Move GameServer validation to a ValidatingAdmissionWebhook #147
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Validation was originally done in a MutationAdmissionWebhook for simplicity, but as we need more validation (for Fleets and supporting CRDs) doing validation work in a Mutation webhook feels like the wrong place to do this work.
This also provides much better validation errors out of kubectl than the Mutation Webhook provides!
So this configures a validation webhook and moves the validation logic into that code.