[Security solution][Detections] fixes incorrect counter for exported rules with exceptions (#138598) (#138833)

## Summary

- addresses https://github.com/elastic/kibana/issues/138354
- adds e2e test

### Checklist

Delete any items that are not applicable to this PR.

- [x] [Unit or functional tests](https://www.elastic.co/guide/en/kibana/master/development-tests.html) were updated or added to match the most common scenarios

(cherry picked from commit c0363b01ba)

Co-authored-by: Vitalii Dmyterko <92328789+vitaliidm@users.noreply.github.com>

x-pack/plugins/security_solution/cypress/integration/detection_rules/export_rule.spec.ts

@@ -21,12 +21,16 @@ import {
   bulkExportRules,
   selectAllRules,
 } from '../../tasks/alerts_detection_rules';
+import { createExceptionList, deleteExceptionList } from '../../tasks/api_calls/exceptions';
+import { getExceptionList } from '../../objects/exception';
 import { createCustomRule } from '../../tasks/api_calls/rules';
 import { cleanKibana, deleteAlertsAndRules } from '../../tasks/common';
 import { login, visitWithoutDateRange } from '../../tasks/login';
 
 import { DETECTIONS_RULE_MANAGEMENT_URL } from '../../urls/navigation';
 
+const exceptionList = getExceptionList();
+
 describe('Export rules', () => {
   before(() => {
     cleanKibana();
@@ -86,4 +90,48 @@ describe('Export rules', () => {
       `Successfully exported ${expectedNumberCustomRulesToBeExported} of ${totalNumberOfRules} rules. Prebuilt rules were excluded from the resulting file.`
     );
   });
+
+  context('rules with exceptions', () => {
+    beforeEach(() => {
+      deleteExceptionList(exceptionList.list_id, exceptionList.namespace_type);
+      // create rule with exceptions
+      createExceptionList(exceptionList, exceptionList.list_id).then((response) =>
+        createCustomRule(
+          {
+            ...getNewRule(),
+            name: 'rule with exceptions',
+            exceptionLists: [
+              {
+                id: response.body.id,
+                list_id: exceptionList.list_id,
+                type: exceptionList.type,
+                namespace_type: exceptionList.namespace_type,
+              },
+            ],
+          },
+          '2'
+        )
+      );
+    });
+
+    it('exports custom rules with exceptions', function () {
+      // one rule with exception, one without it
+      const expectedNumberCustomRulesToBeExported = 2;
+
+      loadPrebuiltDetectionRulesFromHeaderBtn();
+
+      selectAllRules();
+      bulkExportRules();
+
+      // should display correct number of custom rules when one of them has exceptions
+      cy.get(MODAL_CONFIRMATION_BTN)
+        .should('have.text', `Export ${expectedNumberCustomRulesToBeExported} custom rules`)
+        .click();
+
+      cy.get(TOASTER_BODY).should(
+        'contain',
+        `Successfully exported ${expectedNumberCustomRulesToBeExported}`
+      );
+    });
+  });
 });

x-pack/plugins/security_solution/public/detections/pages/detection_engine/rules/all/bulk_actions/utils/dry_run_result.ts

@@ -38,7 +38,7 @@ export const processDryRunResult = (response: BulkActionResponse | undefined): D
  */
 export const transformExportDetailsToDryRunResult = (details: ExportRulesDetails): DryRunResult => {
   return {
-    succeededRulesCount: details.exported_count,
+    succeededRulesCount: details.exported_rules_count,
     failedRulesCount: details.missing_rules_count,
     // if there are rules that can't be exported, it means they are immutable. So we can safely put error code as immutable
     ruleErrors: details.missing_rules.length