We want to disable snapshots globally, since most of our stories
    don't need visual snapshot testing anyway, and we keep going over
    our monthly chromatic snapshot limit.

    Instead, we should deliberately set snapshots to true for stories we
    want chromatic snapshots for.

    - turn off chromatic snapshots globally
    - turn on chromatic snapshots for interactive graph stories

    Issue: https://khanacademy.atlassian.net/browse/LEMS-2579

    Test plan:
    Look at the Chromatic snapshots number on this PR below.
    Previously, it was over 400. It should be much smaller now.