[9.3] [ResponseOps][MaintenanceWindows] Fix mw internal client by passing hidden SO type (#248132) (#248219)

# Backport

This will backport the following commits from `main` to `9.3`:
- [[ResponseOps][MaintenanceWindows] Fix mw internal client by passing
hidden SO type (#248132)](#248132)

<!--- Backport version: 9.6.6 -->

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

<!--BACKPORT [{"author":{"name":"Janki
Salvi","email":"117571355+js-jankisalvi@users.noreply.github.com"},"sourceCommit":{"committedDate":"2026-01-08T09:07:03Z","message":"[ResponseOps][MaintenanceWindows]
Fix mw internal client by passing hidden SO type (#248132)\n\n##
Summary\n\nInternal MW client using internal repository was introduced
in\nhttps://github.com//pull/247390.\nIt created problems
while fetching MWs using all spaces in synthetics\nplugin.\n\nThis PR
fixes the issue.\n\n### Checklist\n\nCheck the PR satisfies following
conditions. \n\nReviewers should verify this PR satisfies this list as
well.\n\n- [x] Review the
[backport\nguidelines](https://docs.google.com/document/d/1VyN5k91e5OVumlc0Gb9RPa3h1ewuPE705nRtioPiTvY/edit?usp=sharing)\nand
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Fix mw internal client by passing hidden SO
type","number":248132,"url":"https://github.com/elastic/kibana/pull/248132","mergeCommit":{"message":"[ResponseOps][MaintenanceWindows]
Fix mw internal client by passing hidden SO type (#248132)\n\n##
Summary\n\nInternal MW client using internal repository was introduced
in\nhttps://github.com//pull/247390.\nIt created problems
while fetching MWs using all spaces in synthetics\nplugin.\n\nThis PR
fixes the issue.\n\n### Checklist\n\nCheck the PR satisfies following
conditions. \n\nReviewers should verify this PR satisfies this list as
well.\n\n- [x] Review the
[backport\nguidelines](https://docs.google.com/document/d/1VyN5k91e5OVumlc0Gb9RPa3h1ewuPE705nRtioPiTvY/edit?usp=sharing)\nand
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Fix mw internal client by passing hidden SO type (#248132)\n\n##
Summary\n\nInternal MW client using internal repository was introduced
in\nhttps://github.com//pull/247390.\nIt created problems
while fetching MWs using all spaces in synthetics\nplugin.\n\nThis PR
fixes the issue.\n\n### Checklist\n\nCheck the PR satisfies following
conditions. \n\nReviewers should verify this PR satisfies this list as
well.\n\n- [x] Review the
[backport\nguidelines](https://docs.google.com/document/d/1VyN5k91e5OVumlc0Gb9RPa3h1ewuPE705nRtioPiTvY/edit?usp=sharing)\nand
apply applicable `backport:*`
labels.","sha":"345ec13b123cf9b880b5e2a71e8630aa464bd403"}}]}]
BACKPORT-->

Co-authored-by: Janki Salvi <117571355+js-jankisalvi@users.noreply.github.com>

Author: kibanamachine

x-pack/platform/plugins/shared/maintenance_windows/server/maintenance_window_client_factory.test.ts

@@ -107,12 +107,16 @@ test('creates an internal maintenance window client', async () => {
   const factory = new MaintenanceWindowClientFactory();
   factory.initialize(maintenanceWindowClientFactoryParams);
   const request = mockRouter.createKibanaRequest();
-  const mockRepository = savedObjectsService.createInternalRepository();
+  const mockRepository = savedObjectsService.createInternalRepository([
+    MAINTENANCE_WINDOW_SAVED_OBJECT_TYPE,
+  ]);
   savedObjectsService.createInternalRepository.mockReturnValue(mockRepository);
 
   factory.createInternal(request);
 
-  expect(savedObjectsService.createInternalRepository).toHaveBeenCalledWith();
+  expect(savedObjectsService.createInternalRepository).toHaveBeenCalledWith([
+    MAINTENANCE_WINDOW_SAVED_OBJECT_TYPE,
+  ]);
 
   const { MaintenanceWindowClient } = jest.requireMock('./client');