Remove unneeded Action View patches for xray-rails

This was originally added to help with a Ruby 3.0 compatibility issue
in xray-rails, but that dependency has since been fixed, so we can
remove these patches now.

Ref: rails/rails#42261 (comment)

lib/nice_partials/monkey_patch.rb

@@ -27,33 +27,4 @@ def render(partial, context, block)
 
     return result
   end
-
-  # This and ActionView::Template#render below are for compatibility
-  # with Ruby 3, as opposed to altering the original functionality.
-  def render_partial_template(view, locals, template, layout, block)
-    ActiveSupport::Notifications.instrument(
-      "render_partial.action_view",
-      identifier: template.identifier,
-      layout: layout && layout.virtual_path
-    ) do |payload|
-      content = template.render(view, locals, ActionView::OutputBuffer.new, {add_to_stack: !block}) do |*name|
-        view._layout_for(*name, &block)
-      end
-
-      content = layout.render(view, locals) { content } if layout
-      payload[:cache_hit] = view.view_renderer.cache_hits[template.virtual_path]
-      build_rendered_template(content, template)
-    end
-  end
-end
-
-class ActionView::Template
-  def render(view, locals, buffer = ActionView::OutputBuffer.new, flag = {add_to_stack: true}, &block)
-    instrument_render_template do
-      compile!(view)
-      view._run(method_name, self, locals, buffer, **flag, &block)
-    end
-  rescue => e
-    handle_render_error(view, e)
-  end
 end