Remove GitLab custom failure app for Devise

What does this MR do?

This fix is intended to replace the https://gitlab.com/gitlab-org/gitlab-ce/commit/5844a21a0acae08a19fa82984dcc0feb1b8777c5

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

I don't know

Why was this MR needed?

To make the Devise configuration easier.

Screenshots (if relevant)

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
• 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/issues/12944