[dagit] Move job metadata into header
As discussed. On the job overview page, move sensor/schedule/run/asset metadata into the header. I've tried to make this section fairly concise.
- Schedule/sensor: the first schedule or sensor in the list for the job. Right now we don't try to handle more than one. We can discuss how best to do this if necessary.
- Latest run: the status and timing of the latest run for the job.
- Related assets: A link directly to one asset (if 1) or a dialog to view all related assets from the last five runs.
I also removed the pieces that had been moved to the right pane in the graph view.
Test Plan: View jobs in Dagit. Verify that the new metadata section renders correctly, with loading and empty states for each item.
Reviewers: bengotow, sandyryza
Reviewed By: sandyryza
Differential Revision: https://dagster.phacility.com/D8897