message: Make sure correct disabledClass applies to Button component
  related (but old):
diff: @route={{@route}}
  @models={{if @models @models (array)}}
  @query={{@query}}
  - @disabled={{@disabled}}
  @disabledClass="boxel-button--disabled-link"
  + @disabled={{@disabled}}
  data-test-boxel-button
  tabindex={{if @disabled -1 0}}
  ...attributes
  