MM-64030/MM-64025/MM-63985/MM-63986/MM-63987/MM-63976/MM-64018/MM-64017/MM-64034/MM-64029 - Various accessibility fixes around User Groups modals (#31147)

* Convert user groups main modal to GenericModal, convert menu to Menu component, fixes

* Added useFocusTrap on other modals, fix DOM ordering

* [MM-64018] Add proper aria-labels to the menu button

* [MM-64025] Convert user group button to an actual button

* [MM-64017] Fixed aria-label on 3-dot menu in view user group modal

* [MM-64030] Show aria-live region when search results are rendered

* Fix tests

* PR feedback

* PR feedback

webapp/platform/components/src/hooks/useFocusTrap.ts

@@ -198,7 +198,7 @@ function isElementVisible(element: HTMLElement): boolean {
         if (
             style.display === 'none' ||
             style.visibility === 'hidden' ||
-            style.opacity === '0' ||
+            style.pointerEvents === 'none' ||
             currentElement.hasAttribute('hidden')
         ) {
             return false;