Making use of prefers-reduced-motion media query (#25641)

* Making use of `prefers-reduced-motion` media query

As discussed in #25249 - if a user (Who is using Safari / iOS) requests
reduced motion in their system settings, we should avoid transitions.

* Ignoring prefers reduced motion for CSS Linting
* Updating copy clarifying the reduce motion functionality in accessibility.md

.stylelintrc

@@ -33,6 +33,9 @@
     "no-descending-specificity": null,
     "no-duplicate-selectors": true,
     "number-leading-zero": "never",
+    "media-feature-name-no-unknown": [true, {
+      "ignoreMediaFeatureNames": ["prefers-reduced-motion"]
+    }],
     "order/properties-order": [
       "position",
       "top",