Summary:
Access endpoints were supposed to provide display versions of emails,
but in fact only the org endpoint was doing so. This brings the
workspaces and docs endpoints into line, and adds tests.
Full user information is tweaked slightly to return an anonymous
flag only when anonymous. This was already anticipated in the
FullUser type.
Test Plan: extended test
Reviewers: dsagal
Reviewed By: dsagal
Differential Revision: https://phab.getgrist.com/D2999
