Add sleep before creating Kueue resources

[jiripetrlik]

Fixes following errors. Service for webhook is not available immediately: error appears Error from server (InternalError): error when creating "STDIN": Internal error occurred: failed calling webhook "mresourceflavor.kb.io": failed to call webhook: Post "https://kueue-webhook-service.kueue-system.svc:443/mutate-kueue-x-k8s-io-v1beta1-resourceflavor?timeout=10s": dial tcp 10.96.115.38:443: connect: connection refused

[openshift-ci[bot]]

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[dgrove-oss]

This is how we handle this in the appwrapper CI. Kueue pod won't report ready until the webhooks are up.

https://github.com/project-codeflare/appwrapper/blob/main/hack/deploy-kueue.sh#L22-L28

[sutaakar]

We use the same code :) Though for some reason occasionally we get webhook error.