Rails 7.1 "config.action_dispatch.show_exceptions" support

[a3626a]

Rails 7.1 added new config option ":rescuable" for "config.action_dispatch.show_exceptions"
(https://mattbrictson.com/blog/rails-71-features#1-finally-we-can-write-proper-integration-tests-for-errors)

Therefore, we can now delete "Rails.env.test?" condition from here:
https://github.com/stas/jsonapi.rb/blob/master/lib/jsonapi/errors.rb#L12-L29

[stas]

I think we'll still need it in order to support older rails versions.

[a3626a]

Why don't you conditionally add "Rails.env.test?" by reading config.action_dispatch.show_exceptions or Rails verison?