fix(ui-alerts): remove live region role warning

INSTUI-5131

Author: ToMESSKa

packages/ui-alerts/src/Alert/v2/README.md

@@ -250,6 +250,7 @@ type: embed
     <Figure.Item>aria-live="polite" alerts will only be announced if the user is not currently doing anything. Polite should be used in most situations involving live regions that present new info to users</Figure.Item>
     <Figure.Item>aria-live="assertive" alerts will be announced to the user as soon as possible, but not necessarily immediately. Assertive should be used if there is information that a user must know about right away, for example, a warning message in a form that does validation on the fly</Figure.Item>
     <Figure.Item>The aria-atomic=BOOLEAN is used to set whether or not the screen reader should always present the live region as a whole, even if only part of the region changes. The possible settings are: false or true. The default setting is false.</Figure.Item>
+    <Figure.Item>If the `liveRegion` element has a `role`, match it to the `liveRegionPoliteness` level: use `role="status"` for `polite` and `role="alert"` for `assertive`.</Figure.Item>
   </Figure>
 </Guidelines>
 ```

packages/ui-alerts/src/Alert/v2/index.tsx

@@ -153,11 +153,6 @@ class Alert extends Component<AlertProps, AlertState> {
   }
 
   initLiveRegion(liveRegion: Element) {
-    error(
-      liveRegion.getAttribute('role') === 'alert',
-      `[Alert] live region must have role='alert' set on page load in order to announce content`
-    )
-
     if (liveRegion) {
       liveRegion.setAttribute('aria-live', this.props.liveRegionPoliteness!)
       // indicates what notifications the user agent will trigger when the