disable buttons that are being submitted

[yshmarov]

• Double click protection with data-disable hotwired/turbo#55 (comment)
• gorails-screencasts/427-turbo-data-attributes@aa18327#diff-1f04c40d9475dca0e5ddc8423a10f452474f36a64e774718791a6766828899c5R27-R28

[yshmarov]

https://www.plum.com.ar/blog/enhance-rails-8-form-ux-with-a-submit-spinner-using-turbo-s-aria-busy-attribute