🌱 envtest: set default webhook options for polling

[mythi]

Similar to how it's done for the CRD installation, set default webhook options for timeout/poll interval values.

This avoids getting MaxTime=0 which changes its behaviour when moving from k8s deprecated wait.PollImmediate() to wait.PollUntilContextTimeout().

Spun off from: #2189

[k8s-ci-robot]

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[sbueringer]

Makes sense to wait for webhooks the same way as we wait for CRDs

/ok-to-test
/lgtm
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: mythi, sbueringer

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