Allow disabling webhook self registration

[povilasv]

This allows users to create custom MutatingWebhookConfiguration objects, allowing users to edit fields like objectSelector or namespaceSelector.

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[bskiba]

Thanks!
One small naming nit.

[bskiba]

fixes #1561

[povilasv]

Thanks for review :)

[bskiba]

/lgtm
/approve

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[APPROVALNOTIFIER] This PR is APPROVED

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[aleksandra-malinowska]

/override tide