[6.0] Atum - add view-transition for pages in administrator (#45787)

* add view-transition for pages in administrator
* shorten css declaration

Author: hans2103

build/media_source/templates/administrator/atum/scss/blocks/_global.scss

@@ -1,4 +1,9 @@
 // Global
+@media screen and (prefers-reduced-motion: no-preference) {
+  @view-transition {
+    navigation: auto;
+  }
+}
 
 html {
   height: 100%;