[dagit] Prevent overscroll on hscroll containers
Prevent overscroll from triggering navigation on hscroll grid containers (Assets, Partitions), at least in Chrome and Firefox. Safari doesn't appear to support overscroll-behavior yet.
Test Plan: Open asset with materialization grid, try hscrolling too far to the left with scroll gesture. Verify that overscrolling is blocked. Repeat in Firefox.
Reviewed By: bengotow
Differential Revision: https://dagster.phacility.com/D7611