Summary:
This calls a new `initialize` method on the sandbox before we start
doing calculations with it, to make sure that `random.seed()` has
been called. Otherwise, if the sandbox is cloned from a checkpoint,
the seed will have been reset.
The `initialize` method includes the functionality previously done
by `set_doc_url` since it is also initialization/personalization and
this way we avoid introducing another round trip to the sandbox.
Test Plan: tested with grist-core configured to use gvisor
Reviewers: georgegevoian, dsagal
Reviewed By: georgegevoian, dsagal
Subscribers: alexmojaki
Differential Revision: https://phab.getgrist.com/D3549
7078922a65