[ODC] Improve ODC/Pipelines documentation structure

https://docs.openshift.com/container-platform/4.12/cicd/pipelines/working-with-pipelines-using-the-developer-perspective.html#op-interacting-with-pipelines-using-the-developer-perspective_working-with-pipelines-using-the-developer-perspective should probably be split into at least two smaller modules with more specific user stories on viewing PipelineRuns vs TaskRuns.

There is a lot of dense information packed into this one module, and a lot of it feels more conceptual than procedural, even though a lot of the information is included as optional procedural steps.

Once this is done, I think it will be easier to include a specific procedure about using the column management feature to turn on the Duration option for TaskRuns and PipelineRuns.