Summary:
This activates the new tests that can run on a grist-core image,
and will not push a new version to `latest` tag unless those tests
pass.
This also runs a smoke test in the regular CI tests, to confirm the
code continues to work without GRIST_TEST_LOGIN enabled.
Test Plan: tested on a fork of grist-core
Reviewers: georgegevoian
Reviewed By: georgegevoian
Differential Revision: https://phab.getgrist.com/D3186