After adding a batch of new server tests, some interactions between
tests have shown up via a shared database. This sets an existing flag
for dealing with this problem, that is used during browser tests but
hadn't been needed before for server tests.
Summary:
This moves some more tests to core that would be useful for ANCT,
which had been stuck in grist-saas due to some entanglements with
sendgrid and billing. For sendgrid, I've moved around just enough
material to permit the tests to run mostly unchanged. Ideally
the interface to a notification system would be generalized, but
that's a bigger project.
Test Plan:
checked that tests are likely to run as expected
in core using preview laid out by ./buildtools/build_core.sh
Reviewers: georgegevoian
Reviewed By: georgegevoian
Differential Revision: https://phab.getgrist.com/D4149
