v1.6.0-rc.1

Fixes included in the RC

• Fix typo in the networkpolicies #2254
• Sync kserve web app manifests v0.8.1 #2256
• Update kubeflow/kubeflow manifests from v1.6.0-rc.1 #2260
  • Support k8s 1.22 in profile controller kubeflow/kubeflow#6491
  • Reload certificates in admission-webhook kubeflow/kubeflow#6581