Install an Argo workflow to run Dask jobs

This is in response to azavea/noaa-hydro-data#120. The task here is to bring the [workflow](https://github.com/azavea/noaa-hydro-data/blob/f79a68d748fcb97a85261fc2bdf5c5f29eb98035/workflows/run-dask-job.yaml) provided in that PR into the cluster as a common piece of infrastructure. It should be available as a `ClusterWorkflowTemplate` in the `daskhub` namespace by default. This implies the need for a flag in `application/daskhub` to select for Argo-related support files, so in the event that Argo has not been installed, the template will be left out.

Start with the referenced run-dask-job.yaml workflow and the application/daskhub configuration. Determine how the workflow can be included as a ClusterWorkflowTemplate in the daskhub namespace by default, and how a flag can omit Argo-related support files when Argo is not installed; done means both selection paths are represented in the deployment resources.

Written by the indexing model from the issue text.