reanahub / reana-workflow-controller / 1179

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workflow_run: notify about third party failures

* Notifies RWC clients (in this case RS) that something went wrong
  while connecting to an external system to start a workflow,
  it is responsibility of the client to act accordignly. In
  the case of RS, it should requeue the workflow and retry
  later (addresses reanahub/reana#253).

* Allows overwriting parameters when calling the workflow
  run manager directory. If we don't allow overwriting the
  operational options or parameters when calling
  `start_batch_workflow_run`, there is a hidden dependency,
  the KubernetesWorkflowRunManager will infer these values from
  DB, creating an order dependency (DB transaction has to happen
  before a workflow run is sent to Kubernetes). Now we can do
  Kubernetes action before DB transaction, that way when we
  change the status in the DB, the workflow will be really
  running.

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