refactor analysis report to utilize sns analysis steps

[stevekm]

Instead of copying over all the base sns wes analysis report files when setting up the analysis report, these should instead be associated with the individual sns analysis tasks that produce the output used by the report fragments. This way, as other sns pipelines are added, they can bring over only the report fragments that are relevant to their output.

[stevekm]

this is going to be important since we need to start integrating other sns pipelines, can't assume that the default output will be from sns wes