Elaborate the return error with kumactl apply global-secrets

[Icarus9913]

Description

I have 1 global-cp-k8s and 1 zone-universal, then I try to create a global-secrets in my zone-universal and got the following errors:

root@icarus-zone-universal:/tmp# cat <<EOF | kumactl apply -f -
> type: GlobalSecret
name: sample-global-secret
data: dGVzdAo=
> EOF
Error: Method not Allowed (Method not allowed)

I think we should make the returned error logs more explicit and teach the users to create a secret in their global-cp environment.

[jakubdyszkiewicz]

Duplicate of #10099