Remove autotest refs (#1744)

* Remove all autotest files and directories

* Tidy up env key reference

* Add changelog

* Fix up new rubocop offense

Author: luke-hill

CHANGELOG.md

@@ -18,6 +18,7 @@ Please visit [cucumber/CONTRIBUTING.md](https://github.com/cucumber/cucumber/blo
 
 ### Removed
 - The sample sinatra tests are no longer used in internal testing (This removes a bunch of superfluous dev gems) ([#1743](https://github.com/cucumber/cucumber-ruby/pull/1743) [luke-hill](https://github.com/luke-hill))
+- Removed all references to autotest as this is an ancient plugin that is not correctly integrated
 
 ## [9.1.0] - 2023-11-14
 ### Changed

lib/autotest/cucumber.rb

@@ -3,7 +3,7 @@
 require 'cucumber/platform'
 require 'cucumber/term/ansicolor'
 
-Cucumber::Term::ANSIColor.coloring = false if !$stdout.tty? && !ENV.key?('AUTOTEST')
+Cucumber::Term::ANSIColor.coloring = false unless $stdout.tty?
 
 module Cucumber
   module Formatter