[server/sources] Fix authenticate on pre-3.10 database
When migrating from a pre-3.10 database, the CWSource entity type and
cw_source relation type are not known, but authenticate should still
work to be able to add them.
addressbook
basket
blog
book
calendar
comment
company
email
file
folder
i18ncontent
keyword
link
mailinglist
person
tag
timeseries
vcsfile