foreman uses turbolinks classic, which won't be supported anymore (rails 6)
therefore there are two options, upgrade turbolinks or remove it with a different inner implementation.
Refs #28217 - Use packaged coffee-rails gem
We currently have 4.2.2 in the rails 5.2 scl, but will need to upgrade
to 5.0 for Rails 6 compat. Using the case statement so we can start
testing Rails 6 before packaging is ready.