Remove RecordTagHelper

* Since #18411, we started to inform about extracted gem (record_tag_helper)
  to developers who use `ActionView::Helpers::RecordTagHelper` 's methods.

* Currently, it seems no problem that we don't have to support no longer.

Author: yhirano55

actionview/CHANGELOG.md

@@ -1,3 +1,7 @@
+*   Remove RecordTagHelper
+
+    *Yoshiyuki Hirano*
+
 *   Disable `ActionView::Template` finalizers in test environment
 
     Template finalization can be expensive in large view test suites.

actionview/lib/action_view/helpers.rb

@@ -23,7 +23,6 @@ module Helpers #:nodoc:
     autoload :JavaScriptHelper, "action_view/helpers/javascript_helper"
     autoload :NumberHelper
     autoload :OutputSafetyHelper
-    autoload :RecordTagHelper
     autoload :RenderingHelper
     autoload :SanitizeHelper
     autoload :TagHelper
@@ -57,7 +56,6 @@ def self.eager_load!
     include JavaScriptHelper
     include NumberHelper
     include OutputSafetyHelper
-    include RecordTagHelper
     include RenderingHelper
     include SanitizeHelper
     include TagHelper