OCPBUGS-45746:remove preview label

Author: brendan-daly-red-hat

modules/installing-gcp-cluster-creation.adoc

@@ -23,7 +23,6 @@ Labels and tags are defined during the `install-config.yaml` creation phase, and
 [source,yaml]
 ----
 apiVersion: v1
-featureSet: TechPreviewNoUpgrade
 platform:
  gcp:
    userLabels: <1>