[9.1] [a11y][ml] fix trained model spaces button screenreader (#225980) (#226382)

# Backport

This will backport the following commits from `main` to `9.1`:
- [[a11y][ml] fix trained model spaces button screenreader
(#225980)](#225980)

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

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

<!--BACKPORT [{"author":{"name":"Paulina
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fix trained model spaces button screenreader (#225980)\n\n##
Summary\nThis PR resolves [[ML] Trained Models: Hidden space buttons in
models\nlist are missing
discernible\ntext](#216678)
issue.\n\n\n<img width=\"1481\" alt=\"Screenshot 2025-07-01 at 13 11
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fix trained model spaces button
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fix trained model spaces button screenreader (#225980)\n\n##
Summary\nThis PR resolves [[ML] Trained Models: Hidden space buttons in
models\nlist are missing
discernible\ntext](#216678)
issue.\n\n\n<img width=\"1481\" alt=\"Screenshot 2025-07-01 at 13 11
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fix trained model spaces button screenreader (#225980)\n\n##
Summary\nThis PR resolves [[ML] Trained Models: Hidden space buttons in
models\nlist are missing
discernible\ntext](#216678)
issue.\n\n\n<img width=\"1481\" alt=\"Screenshot 2025-07-01 at 13 11
35\"\nsrc=\"https://github.com/user-attachments/assets/5a4ba796-2610-4880-b798-1a01cff337bc\"\n/>\n\nCo-authored-by:
Elastic Machine
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Co-authored-by: Paulina Shakirova <[email protected]>
Co-authored-by: Elastic Machine <[email protected]>

Author: 3 people

x-pack/platform/plugins/shared/ml/public/application/components/ml_saved_objects_spaces_list/ml_saved_objects_spaces_list.tsx

@@ -114,6 +114,14 @@ export const MLSavedObjectsSpacesList: FC<Props> = ({
         onClick={() => setShowFlyout(true)}
         style={{ height: 'auto' }}
         data-test-subj="mlJobListRowManageSpacesButton"
+        aria-label={i18n.translate(
+          'xpack.ml.management.jobsSpacesList.manageSpacesButtonAriaLabel',
+          {
+            defaultMessage: 'Manage spaces for this {mlSavedObjectType}',
+            values: { mlSavedObjectType },
+          }
+        )}
+        tabIndex={spaceIds.length > 0 ? 0 : -1}
       >
         <LazySpaceList namespaces={spaceIds} displayLimit={0} behaviorContext="outside-space" />
       </EuiButtonEmpty>