[7.17] Fix flaky licensing test #148313 (#182712) (#182746)

# Backport

This will backport the following commits from `main` to `7.17`:
- [Fix flaky licensing test #148313
(#182712)](#182712)

<!--- Backport version: 9.4.3 -->

### Questions ?
Please refer to the [Backport tool
documentation](https://github.com/sqren/backport)

<!--BACKPORT [{"author":{"name":"Alejandro Fernández
Haro","email":"alejandro.haro@elastic.co"},"sourceCommit":{"committedDate":"2024-05-06T19:25:25Z","message":"Fix
flaky licensing test #148313
(#182712)","sha":"6740ffb8761097a35dd9be7b353fff33eef3d0da","branchLabelMapping":{"^v8.15.0$":"main","^v(\\d+).(\\d+).\\d+$":"$1.$2"}},"sourcePullRequest":{"labels":["Team:Core","release_note:skip","backport:all-open","v8.15.0"],"title":"Fix
flaky licensing test
#148313","number":182712,"url":"#182712
flaky licensing test #148313
(#182712)","sha":"6740ffb8761097a35dd9be7b353fff33eef3d0da"}},"sourceBranch":"main","suggestedTargetBranches":[],"targetPullRequestStates":[{"branch":"main","label":"v8.15.0","branchLabelMappingKey":"^v8.15.0$","isSourceBranch":true,"state":"MERGED","url":"#182712
flaky licensing test #148313
(#182712)","sha":"6740ffb8761097a35dd9be7b353fff33eef3d0da"}}]}]
BACKPORT-->

Co-authored-by: Alejandro Fernández Haro <alejandro.haro@elastic.co>

x-pack/test/licensing_plugin/scenario.ts

@@ -17,6 +17,7 @@ export function createScenario({ getService, getPageObjects }: FtrProviderContex
   const esSupertestWithoutAuth = getService('esSupertestWithoutAuth');
   const security = getService('security');
   const PageObjects = getPageObjects(['common', 'security']);
+  const retry = getService('retry');
 
   const scenario = {
     async setup() {
@@ -109,9 +110,27 @@ export function createScenario({ getService, getPageObjects }: FtrProviderContex
     },
 
     async waitForPluginToDetectLicenseUpdate() {
+      const {
+        body: { license: esLicense },
+      } = await esSupertestWithoutAuth
+        .get('/_license')
+        .auth('license_manager_user', 'license_manager_user-password')
+        .expect(200);
       // > --xpack.licensing.api_polling_frequency set in test config
       // to wait for Kibana server to re-fetch the license from Elasticsearch
-      await delay(500);
+      const pollingFrequency = 500;
+
+      await retry.waitForWithTimeout(
+        'waiting for the license.uid to match ES',
+        4 * pollingFrequency,
+        async () => {
+          const {
+            body: { license: kbLicense },
+          } = await supertest.get('/api/licensing/info').expect(200);
+          return kbLicense?.uid === esLicense?.uid;
+        },
+        () => delay(pollingFrequency)
+      );
     },
   };
   return scenario;