feat: wait betterer

Add custom wait script execution.

These are needed because of the operator/customresource creations sometimes not happening quick enough. This ensures that by the time cypress testing happens all resources are ready to go in every case.

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Elastic MR: https://repo1.dso.mil/platform-one/big-bang/apps/core/elasticsearch-kibana/-/merge_requests/19 Istio MR: https://repo1.dso.mil/platform-one/big-bang/apps/core/istio-controlplane/-/merge_requests/22