Remove 4 unroutable routes from ActionMailbox

[natematykiewicz]

Summary

I was auditing which routes in my app do not actually a have corresponding controller action. ActionMailbox's inbound_emails has these 4 routes defined, which do not actually work.

                            Prefix Verb   URI Pattern                                                       Controller#Action
edit_rails_conductor_inbound_email GET    /rails/conductor/action_mailbox/inbound_emails/:id/edit(.:format) rails/conductor/action_mailbox/inbound_emails#edit
                                   PATCH  /rails/conductor/action_mailbox/inbound_emails/:id(.:format)      rails/conductor/action_mailbox/inbound_emails#update
                                   PUT    /rails/conductor/action_mailbox/inbound_emails/:id(.:format)      rails/conductor/action_mailbox/inbound_emails#update
                                   DELETE /rails/conductor/action_mailbox/inbound_emails/:id(.:format)      rails/conductor/action_mailbox/inbound_emails#destroy

Other Information

Here's the corresponding controller, where you can see that only 4 actions are defined, not 7.
https://github.com/rails/rails/blob/ef52dd906ed4ef9f1578119e27b712d11e68009d/actionmailbox/app/controllers/rails/conductor/action_mailbox/inbound_emails_controller.rb

[etiennebarrie]

Maybe we could also set format: false to all these routes since the controllers don't use the format? But that might be better in another PR.

👍 cc @byroot

[byroot]

Thanks.