[Cloud Security] skip flaky ftr test in v8.18 (elastic#211909)

## Summary

skip flaky test elastic#211499


### Checklist
- [x] The PR description includes the appropriate Release Notes section,
and the correct `release_note:*` label is applied per the
[guidelines](https://www.elastic.co/guide/en/kibana/master/contributing.html#kibana-release-notes-process)

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

x-pack/test/cloud_security_posture_functional/pages/findings_onboarding.ts

@@ -44,7 +44,8 @@ export default ({ getPageObjects }: FtrProviderContext) => {
       await PageObjects.common.waitUntilUrlIncludes('add-integration/vuln_mgmt');
     });
 
-    it('Vulnerabilities - clicking on the `Third party integrations` prompt action button - `Wiz Integration`: navigates to the Wiz integration installation page', async () => {
+    // fixed by https://github.com/elastic/kibana/pull/211363 in v9.0
+    it.skip('Vulnerabilities - clicking on the `Third party integrations` prompt action button - `Wiz Integration`: navigates to the Wiz integration installation page', async () => {
       await findings.navigateToLatestVulnerabilitiesPage();
       await PageObjects.header.waitUntilLoadingHasFinished();
       const element = await thirdPartyIntegrationsNoVulnerabilitiesFindingsPrompt.getElement();