[scout] pre-create ES .security-* indexes before parallel tests are run (elastic#234269)

## Summary

Adding `preCreateSecurityIndexes` Playwright fixture to run
automatically as a part of `globalSetup` hook for parallel tests
execution.
This fixture is a workaround to pre-create ES `.security-*` indexes
before actual tests run: today we periodically see ES responding with
401 when authentication is run concurrently while those indexes do not
exist. Since Kibana doesn't retry this error, tests execution fails due
to failed login.

Author: dmlemeshko

src/platform/packages/shared/kbn-scout/src/playwright/test/ui/index.ts

@@ -8,16 +8,16 @@
  */
 
 import { scoutFixtures, lighthouseFixtures } from './single_thread_fixtures';
-import { scoutParallelFixtures, globalSetup } from './parallel_run_fixtures';
+import { scoutParallelFixtures, globalSetupFixtures } from './parallel_run_fixtures';
 
 // Scout UI test fixtures: single-threaded
 export const test = scoutFixtures;
 // Scout UI test fixtures: single-threaded with Lighthouse
 export const lighthouseTest = lighthouseFixtures;
 // Scout core 'space aware' fixtures: parallel execution
 export const spaceTest = scoutParallelFixtures;
-// Scout global setup hook for parallel execution
-export const globalSetupHook = globalSetup;
+// Scout global 'setup' hook for parallel execution
+export const globalSetupHook = globalSetupFixtures;
 
 export type { ScoutTestFixtures, ScoutWorkerFixtures } from './single_thread_fixtures';
 export type {

src/platform/packages/shared/kbn-scout/src/playwright/test/ui/parallel_run_fixtures.ts

@@ -17,6 +17,7 @@ import {
 } from '../../fixtures/scope/worker';
 import type {
   ApiServicesFixture,
+  CoreWorkerFixtures,
   EsClient,
   KbnClient,
   KibanaUrl,
@@ -60,9 +61,34 @@ export interface ScoutParallelWorkerFixtures {
   apiServices: ApiServicesFixture;
 }
 
-export const globalSetup = mergeTests(
+/**
+ * Pre-creates Elasticsearch Security indexes (.security-tokens, .security-profile)
+ * during global setup to prevent race conditions when parallel tests perform their first SAML authentication.
+ */
+const preCreateSecurityIndexesFixture = coreWorkerFixtures.extend<
+  {},
+  { samlAuth: CoreWorkerFixtures['samlAuth']; preCreateSecurityIndexes: void }
+>({
+  preCreateSecurityIndexes: [
+    async (
+      {
+        samlAuth,
+        log,
+      }: { samlAuth: CoreWorkerFixtures['samlAuth']; log: CoreWorkerFixtures['log'] },
+      use: (arg: void) => Promise<void>
+    ) => {
+      log.debug('Running SAML authentication to pre-create Elasticsearch .security indexes');
+      await samlAuth.session.getInteractiveUserSessionCookieWithRoleScope('admin');
+      await use();
+    },
+    { scope: 'worker', auto: true },
+  ],
+});
+
+export const globalSetupFixtures = mergeTests(
   coreWorkerFixtures,
   esArchiverFixture,
   synthtraceFixture,
-  apiServicesFixture
+  apiServicesFixture,
+  preCreateSecurityIndexesFixture
 );