[Onboarding][Firehose] Add flag to skip AWS assets installation (#196325

)

Closes #193857
Resolves #193294

Turns out, dockerized registry is [already being
used](https://buildkite.com/elastic/kibana-on-merge/builds/51727#01926d5a-f424-4b8e-b835-0f731c6ddc8d/264-454)
for Firehose tests and it's still failing sometimes. So this change adds
an explicit flag to skip installation of AWS assets as they are not
essential to complete the flow, only the Firehose integration is
required.

[Flaky test runner
job](https://buildkite.com/elastic/kibana-flaky-test-suite-runner/builds/7167).

x-pack/plugins/observability_solution/observability_onboarding/server/routes/firehose/route.ts

@@ -42,11 +42,11 @@ const createFirehoseOnboardingFlowRoute = createObservabilityOnboardingServerRou
     request,
     plugins,
     services,
+    logger,
   }): Promise<CreateFirehoseOnboardingFlowRouteResponse> {
     const {
       elasticsearch: { client },
     } = await context.core;
-
     const hasPrivileges = await hasLogMonitoringPrivileges(client.asCurrentUser);
 
     if (!hasPrivileges) {
@@ -61,9 +61,19 @@ const createFirehoseOnboardingFlowRoute = createObservabilityOnboardingServerRou
     const [{ encoded: apiKeyEncoded }] = await Promise.all([
       createShipperApiKey(client.asCurrentUser, 'firehose_onboarding'),
       packageClient.ensureInstalledPackage({ pkgName: 'awsfirehose' }),
-      packageClient.ensureInstalledPackage({ pkgName: 'aws' }),
     ]);
 
+    /**
+     * Triggering the AWS package installation but not
+     * waiting for the completion as it might take a while.
+     * The AWS integration is not required for data ingestion
+     * and can be installed separately in case it fails to install
+     * during onboarding.
+     */
+    packageClient.ensureInstalledPackage({ pkgName: 'aws' }).catch((error) => {
+      logger.error(`Failed installing AWS package: ${error}`);
+    });
+
     const elasticsearchUrlList = plugins.cloud?.setup?.elasticsearchUrl
       ? [plugins.cloud?.setup?.elasticsearchUrl]
       : await getFallbackESUrl(services.esLegacyConfigService);

x-pack/test_serverless/functional/test_suites/observability/onboarding/firehose.ts

@@ -20,8 +20,7 @@ export default function ({ getPageObjects, getService }: FtrProviderContext) {
   const testSubjects = getService('testSubjects');
   const synthtrace = getService('svlLogsSynthtraceClient');
 
-  // FLAKY: https://github.com/elastic/kibana/issues/193294
-  describe.skip('Onboarding Firehose Quickstart Flow', () => {
+  describe('Onboarding Firehose Quickstart Flow', () => {
     before(async () => {
       await PageObjects.svlCommonPage.loginAsAdmin(); // Onboarding requires admin role
       await PageObjects.common.navigateToUrlWithBrowserHistory(