Forbid to use add_column_with_default on ci_pipelines by rubocop

What does this MR do?

This MR forbids to use add_column_with_default on ci_pipelines by rubocop.

Originally this MR was asked by @ayufan at https://gitlab.slack.com/archives/C0SFP840G/p1501513358299742.

Are there points in the code the reviewer needs to double check?

Why was this MR needed?

Because ci_pipeliens is a huge table.

Screenshots (if relevant)

N/A

Does this MR meet the acceptance criteria?

• Changelog entry added, if necessary
• Documentation created/updated
• API support added
• Tests
  • Added for this feature/bug
  • All builds are passing
• Review
  • Has been reviewed by Backend
• Conform by the merge request performance guides
• Conform by the style guides
• Branch has no merge conflicts with master (if it does - rebase it please)
• Squashed related commits together

What are the relevant issue numbers?

• https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/13194

/cc @ayufan @godfat