Revert "Placeholder for transitions reset to prevent code duplication #29862"

This reverts commit cd7e5d1111.

Co-authored-by: Martijn Cuppens <martijn.cuppens@gmail.com>

scss/mixins/_transition.scss

@@ -9,19 +9,8 @@
   }
 
   @if $enable-prefers-reduced-motion-media-query {
-    $isolate: false;
-    @each $selector in $pseudo-vendor-prefixes {
-      @if str-index(quote(#{&}), $selector) {
-        $isolate: true;
-      }
-    }
-
-    @if $isolate {
-      @media (prefers-reduced-motion: reduce) {
-        transition: none;
-      }
-    } @else {
-      @extend %no-transition;
+    @media (prefers-reduced-motion: reduce) {
+      transition: none;
     }
   }
 }