Add a check to prevent simultaneous use of rails-ujs and alt-ujs

[taketo1113]

Summary

Raises an error if both rails-ujs and alt-ujs are loaded, ensuring only alt-ujs is used when both are present.

Details

If both alt-ujs and rails-ujs are loaded, events like the confirm event may be triggered multiple times.
To prevent this, an error is raised when rails-ujs is detected.

Whether rails-ujs is loaded is determined by checking window._rails_loaded.
https://github.com/rails/rails/blob/7-1-stable/actionview/app/javascript/rails-ujs/index.js#L135