Revert "Extract EE-specific code from spec/factories/projects.rb"

What does this MR do?

Fixes ~"broken master".

With https://gitlab.com/gitlab-org/gitlab-ee/commit/ab90a49c330a20da93506fb79b1cfe025dee2f9d, we have an order-dependent failure (https://gitlab.com/gitlab-org/gitlab-ee/issues/9846#note_142953507). After reverting, it passes again

What are the relevant issue numbers?

Closes https://gitlab.com/gitlab-org/gitlab-ee/issues/9846

Does this MR meet the acceptance criteria?

• [-] Changelog entry added, if necessary
• [-] Documentation created/updated via this MR
• [-] Documentation reviewed by technical writer or follow-up review issue created
• [-] Tests added for this feature/bug
• [-] Tested in all supported browsers
• Conforms to the code review guidelines
• Conforms to the merge request performance guidelines
• Conforms to the style guides
• [-] Conforms to the database guides
• [-] Link to e2e tests MR added if this MR has Requires e2e tests label. See the Test Planning Process.
• EE specific content should be in the top level /ee folder
• [-] For a paid feature, have we considered GitLab.com plans, how it works for groups, and is there a design for promoting it to users who aren't on the correct plan?
• Security reports checked/validated by reviewer