- Fix #54563
- ### Context

  In a future version of Bundler, running `bundle binstub bundler`
  will no longer generate a `bin/bundle` binstub.
  The reason for this change upstream is well explained in
  https://github.com/rubygems/rubygems/pull/8345.

  ### Problem

  When the change in Bundler is cut into a release, generating
  new rails application will throw a Bundler warning, and
  the AuthenticationGenerator which makes use of `bin/bundle` will
  stop working.

  ### Solution

  Stop generating a bundler binstub and modify the generator
  to use the same bundler command as the rest of the codebase.