force run view under pipeline in url namespace
The Run history refactor split out the runs view to be independent of a given pipeline. The TopNav component assumes that there is a selected pipeline, which gives the context for the Explore and Execute tabs.
This diff changes a single run view to still be scoped under a specific pipeline, changing the URL to include the loaded pipeline name.
Any loads of a single run view (/run/:runId) will redirect to a URL containing the pipeline name (/:pipelineName/run/:runId)
Test Plan: clicked to runs view, clicked through to single run view, saw appropriate url with pipeline name, and top nav dropdown populated
Reviewers: #ft, bengotow, sashank
Reviewed By: #ft, bengotow, sashank
Differential Revision: https://dagster.phacility.com/D909