Remove unnecessary permissions from shipwright-build-webhook

[SaschaSchwarze0]

Changes

When we introduced the shipwright-build-webhook for the conversion between alpha and beta, we also added a role and role binding. But, given the webhook only converts in-memory the objects, it does not require any Kubernetes permissions at all. If we eventually use it for admission, the story may change, but that's future.

Submitter Checklist

• Includes tests if functionality changed/was added
• Includes docs if changes are user-facing
• Set a kind label on this PR
• Release notes block has been filled in, or marked NONE

Release Notes

action required: after you upgraded from v0.12 to v0.13, you can run the following two commands to remove unnecessary permissions: `kubectl delete crb shipwright-build-webhook && kubectl delete cr shipwright-build-webhook`

[qu1queee]

/approve
/lgtm

[openshift-ci]

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