As projects now have project_namespace_id column in order
to mass generate projects we also need to mass generate
corresponding project namespaces. Because we generate massive
number of projects and project namespaces and corresponding
routes and feature settings the transaction becomes a bit too
big which leads to timeouts or transaction taking too long to
commit, that is why splitting the generation of corresponding
associations(routes, features, etc) into separate files helps
make the transactions smaller.