Revert "Consolidate split panel handling, save divider locations to local storage"
This reverts commit ef23ea3c3aa8b89adb0c92e7bbf1fd3d9684d8e6.
D1216 broke the runs page as it causes an infinite recursion. Reverting for now.
Tracking fixing in issue: https://github.com/dagster-io/dagster/issues/1822
Test Plan: Run pipeline
Reviewers: #ft, bengotow, prha
Reviewed By: #ft, prha
Differential Revision: https://dagster.phacility.com/D1248