[8.17] Stabilize inference endpoint svl search tests for MKI (elastic…

…#201492) (elastic#201495)

# Backport

This will backport the following commits from `main` to `8.17`:
- [Stabilize inference endpoint svl search tests for MKI
(elastic#201492)](elastic#201492)

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

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

<!--BACKPORT [{"author":{"name":"Robert
Oskamp","email":"[email protected]"},"sourceCommit":{"committedDate":"2024-11-23T09:44:01Z","message":"Stabilize
inference endpoint svl search tests for MKI (elastic#201492)\n\n##
Summary\r\n\r\nThis PR stabilizes the inference endpoint serverless
earch UI tests for\r\nMKI runs by waiting for loading to finish after
refreshing the
page.","sha":"9a8ef27e5347cba13de2b21146ea0c7908c579de","branchLabelMapping":{"^v9.0.0$":"main","^v8.18.0$":"8.x","^v(\\d+).(\\d+).\\d+$":"$1.$2"}},"sourcePullRequest":{"labels":["release_note:skip","v9.0.0","backport:version","v8.17.0","v8.18.0"],"title":"Stabilize
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inference endpoint svl search tests for MKI (elastic#201492)\n\n##
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earch UI tests for\r\nMKI runs by waiting for loading to finish after
refreshing the
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inference endpoint svl search tests for MKI (elastic#201492)\n\n##
Summary\r\n\r\nThis PR stabilizes the inference endpoint serverless
earch UI tests for\r\nMKI runs by waiting for loading to finish after
refreshing the
page.","sha":"9a8ef27e5347cba13de2b21146ea0c7908c579de"}},{"branch":"8.17","label":"v8.17.0","branchLabelMappingKey":"^v(\\d+).(\\d+).\\d+$","isSourceBranch":false,"state":"NOT_CREATED"},{"branch":"8.x","label":"v8.18.0","branchLabelMappingKey":"^v8.18.0$","isSourceBranch":false,"state":"NOT_CREATED"}]}]
BACKPORT-->

Co-authored-by: Robert Oskamp <[email protected]>

x-pack/test_serverless/functional/test_suites/search/inference_management.ts

@@ -16,6 +16,7 @@ export default function ({ getPageObjects, getService }: FtrProviderContext) {
     'svlCommonPage',
     'embeddedConsole',
     'svlSearchInferenceManagementPage',
+    'header',
   ]);
   const svlSearchNavigation = getService('svlSearchNavigation');
   const browser = getService('browser');
@@ -66,6 +67,7 @@ export default function ({ getPageObjects, getService }: FtrProviderContext) {
       beforeEach(async () => {
         await ml.api.createInferenceEndpoint(endpoint, taskType, modelConfig);
         await browser.refresh();
+        await pageObjects.header.waitUntilLoadingHasFinished();
       });
 
       after(async () => {