manifests-gen: set failurePolicy to Ignore for IPAM webhooks

[damdo]

Closing in favour of openshift/cluster-api#256

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Add functions to set the failurePolicy to Ignore for both mutating and validating webhooks handling IPAM resources.

During bootstrap, the bootstrap node's Kube API Server receives IPAM create requests but is unable
to reach the webhooks in the Cluster API namespace.

This is because the bootstrap node doesn't have a route to the pods as it doesn't have access to the pod networks.
If failurePolicy is set to Fail, the KAS cannot reach the webhook endpoints and the request fails, preventing creation of IPAddress and IPAddressClaim resources.

This causes a chicken-and-egg problem as it prevents IPAM provisioning
for the workers which won't start without their IP addresses being allocated.

Setting failurePolicy to Ignore allows the resources to be created even when the webhooks are
unreachable during bootstrap, matching what Machine API also does.

More context: https://redhat-internal.slack.com/archives/C0A2M43S199/p1765540108488539

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[damdo]

Closing in favour of openshift/cluster-api#256