spec(build): apply an order before paging

Build.paged alone doesn't order the output, which means that the order is
undefined. The second test in the diff depends on the order of the builds, so
the result of the test is indeterminate (although it almost always seems to
pass).
spec(remove_log): stubs->activerecord

Using factories without including Support::ActiveRecord causes the database
cleaner not to run after the test, which leaves extra record in the database and
sometimes breaks other tests depending on their order.

None of the tests seem to use the DB specs, so I removed them from these tests.