Add support for running helmfile on arbitrarily configured clusters

Currently helmfile composition generates kubernetes cluster context information for eks clusters via `aws eks update-kubeconfig` commands.
Previously if required variables to generate were missing the tool would run with default kubernetes context configured.

Since this has proven to be dangerous running against default context has been removed.
To be able to run helmfile composition against non eks clusters support for explicit context selection needs to be added in ops-cli

Comienza en el punto de entrada de composición de helmfile en ops-cli y sigue la generación de contexto de EKS existente mediante aws eks update-kubeconfig. Se considera terminado cuando los clústeres que no son EKS pueden seleccionar un contexto de Kubernetes explícito y la herramienta nunca recurre al contexto predeterminado.

Escrito por el modelo de indexación a partir del texto del issue.