Summary:
Migrations were failing in snapshots due to the sandbox no longer
being started in snapshots. We now start up an instance of the
sandbox whenever there are migrations to run, and immediately shut
it down on completion.
Test Plan: Server test.
Reviewers: paulfitz
Reviewed By: paulfitz
Subscribers: dsagal
Differential Revision: https://phab.getgrist.com/D3898
Summary: This test has been added to core. This diff also updates some storage-related code in monorepo to match changes in core.
Test Plan: moving test
Reviewers: georgegevoian
Reviewed By: georgegevoian
Differential Revision: https://phab.getgrist.com/D3746
