Rely on Rails to enable YJIT when available (#33017)

config/initializers/enable_yjit.rb

@@ -1,13 +0,0 @@
-# frozen_string_literal: true
-
-# Automatically enable YJIT as of Ruby 3.3, as it brings very
-# sizeable performance improvements.
-
-# If you are deploying to a memory constrained environment
-# you may want to delete this file, but otherwise it's free
-# performance.
-if defined?(RubyVM::YJIT.enable)
-  Rails.application.config.after_initialize do
-    RubyVM::YJIT.enable
-  end
-end