Improve output of `get-wc-kubeconfig-from-rancher.sh`

Médéric de Verdilhacrequested to merge
fix_workload_cluster_dump_capm3 into main

What does this MR do and why?

A little cosmetic enhancement of get-wc-kubeconfig-from-rancher.sh used to retrieve workload kubeconfig from Rancher API.

Edited by Médéric de Verdilhac

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