feat: Search a11y updated behavior. (#1614)

* feat: Updated accesibility on courseware search modal

* chore: Updated i18n to use useIntl() hook and dialog behavior updates

* feat: Added close when clicking on the modal backdrop

* chore: Swapped remove listeners with an AbortController

* fix: Fixed tests

* chore: Rolled back unintended husky script change

src/setupTest.js

@@ -61,6 +61,18 @@ const supressWarningBlock = (callback) => {
 };
 /* eslint-enable no-console */
 
+// Mocks for HTML Dialogs behavior. */
+// jsdom does not support HTML Dialogs yet: https://github.com/jsdom/jsdom/issues/3294
+HTMLDialogElement.prototype.show = jest.fn();
+HTMLDialogElement.prototype.showModal = jest.fn(function mock() {
+  const onShowModal = new CustomEvent('show_modal');
+  this.dispatchEvent(onShowModal);
+});
+HTMLDialogElement.prototype.close = jest.fn(function mock() {
+  const onClose = new CustomEvent('close');
+  this.dispatchEvent(onClose);
+});
+
 // Mock Intersection Observer which is unavailable in the context of a test.
 global.IntersectionObserver = jest.fn(function mockIntersectionObserver() {
   this.observe = jest.fn();