Run ActionPack test cases in random order.

actionpack/test/abstract_unit.rb

@@ -483,8 +483,3 @@ def translate_exceptions(result)
   # Use N processes (N defaults to 4)
   Minitest.parallel_executor = ForkingExecutor.new(PROCESS_COUNT)
 end
-
-# FIXME: we have tests that depend on run order, we should fix that and
-# remove this method call.
-require 'active_support/test_case'
-ActiveSupport::TestCase.test_order = :sorted