Add support for sorting pipelines in Jenkins pipeline based views

Delivery pipeline views based on traditional Jenkins jobs can be sorted using different strategies, e.g. by failed pipelines or latest activity. Add support for the same options for Jenkins pipeline based views.

Requires some refactoring to allow the same data structure to be used in the comparators to avoid code duplication as DeliveryPipelineView and WorkflowPipelineView classes have completely different data models.