The check for cluster existence is not compatible with new version of eksctl

[dale-c-anderson]

The 0.38.0 release of the eksctl utility has started to always output timestamp and version information, which breaks all the stdout checks for No clusters found strings in tasks/eks-cluster.task.yaml and eks-destroy-cluster.playbook.yaml.

Old/Working:

$ eksctl version
0.36.2

$ eksctl get cluster --region us-west-2
No clusters found

New/Noisy/Breaky:

$ eksctl version 
0.38.0

$ eksctl get cluster --region us-west-2 
2021-02-25 09:54:00 [ℹ]  eksctl version 0.38.0
2021-02-25 09:54:00 [ℹ]  using region us-west-2
No clusters found

To Reproduce
Use the repo to create a new cluster (which pulls the latest version of eksctl), or upgrade an existing bastion's eksctl version to 0.38.0

Possible fix
eksctl has a --verbose 0 flag that silences all the extra stuff, which will get the checks working again, but this still seems somewhat brittle; maybe there's a better way to check.