[Security Solution][Exceptions] - Add back exceptions export success …

…toast (#131952)

Addresses #88449

It appears that the success toaster code was deleted at some point as the text for the toaster was already there just not in use. Simple fix to add back in. Added check for toaster to existing cypress test.

x-pack/plugins/security_solution/cypress/integration/exceptions/exceptions_table.spec.ts

@@ -28,6 +28,7 @@ import {
 } from '../../screens/exceptions';
 import { createExceptionList } from '../../tasks/api_calls/exceptions';
 import { esArchiverResetKibana } from '../../tasks/es_archiver';
+import { TOASTER } from '../../screens/alerts_detection_rules';
 
 const getExceptionList1 = () => ({
   ...getExceptionList(),
@@ -79,11 +80,14 @@ describe('Exceptions Table', () => {
     waitForExceptionsTableToBeLoaded();
     exportExceptionList();
 
-    cy.wait('@export').then(({ response }) =>
-      cy
-        .wrap(response?.body)
-        .should('eql', expectedExportedExceptionList(this.exceptionListResponse))
-    );
+    cy.wait('@export').then(({ response }) => {
+      cy.wrap(response?.body).should(
+        'eql',
+        expectedExportedExceptionList(this.exceptionListResponse)
+      );
+
+      cy.get(TOASTER).should('have.text', 'Exception list export success');
+    });
   });
 
   it('Filters exception lists on search', () => {

x-pack/plugins/security_solution/public/detections/pages/detection_engine/rules/all/exceptions/exceptions_table.tsx

@@ -96,7 +96,7 @@ export const ExceptionListsTable = React.memo(() => {
   const [exportingListIds, setExportingListIds] = useState<string[]>([]);
   const [exportDownload, setExportDownload] = useState<{ name?: string; blob?: Blob }>({});
   const { navigateToUrl } = application;
-  const { addError } = useAppToasts();
+  const { addError, addSuccess } = useAppToasts();
 
   const handleDeleteSuccess = useCallback(
     (listId?: string) => () => {
@@ -165,9 +165,10 @@ export const ExceptionListsTable = React.memo(() => {
   const handleExportSuccess = useCallback(
     (listId: string) =>
       (blob: Blob): void => {
+        addSuccess(i18n.EXCEPTION_EXPORT_SUCCESS);
         setExportDownload({ name: listId, blob });
       },
-    []
+    [addSuccess]
   );
 
   const handleExportError = useCallback(