Use the semantic <details> HTML tag instead for disclosure (#25489)

GitOrigin-RevId: 9ed634529a17abd0693441c7563262ed5d1c7f88

services/web/frontend/stylesheets/bootstrap-5/pages/onboarding.scss

@@ -106,7 +106,6 @@
   user-select: none;
 }
 
-.onboarding-collapse-button,
 .onboarding-privacy-extended {
   @include media-breakpoint-down(md) {
     padding: 0 var(--spacing-08);