In 8278b763d96ef10c6494409b18b7eb541463af29 the default behaviour of annotation
has changes, which was causing a lot of noise in diffs. We decided in #17382
that it is better to get rid of the whole annotate gem, and instead let people
look at schema.rb for the columns in a table.
Fixes: #17382
This fixes ./spec/services/projects/unlink_fork_service_spec.rb which
somehow started failing on the master branch. It certainly isn't a very
elegant solution but seems to be the easiest/best way of solving this
problem for the time being.