build: Remove misleading logs from minimal-crdgen.sh

[terrytangyuan]

The current logs are misleading which may look like both the minimal and full CRDs are applied to the cluster twice:

./hack/minimal-crdgen.sh
Patching config/crd/full/serving.kserve.io_servingruntimes.yaml
Creating config/crd/minimal/serving.kserve.io_servingruntimes.yaml

The PR makes it less confusing.

/cc @yuzisun

[yuzisun]

/lgtm
/approve

[oss-prow-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: terrytangyuan, yuzisun

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