fix: [Analytics:MachineLearning:AnomalyDetection:Jobs page] Edit model snapshot flyout missing title from announcement (#217831)

Closes: #216147

**Description**
Dialog modal, flyout, field visible title should be announced for the
users, especially using assistive technology to know what dialog modal,
flyout opened, what field is active and what is needed to enter in it.

**Changes made:**

1. Added` aria-labelledby={flyoutTitleId} `for mentioned places

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

@@ -24,6 +24,7 @@ import {
   EuiSwitch,
   EuiConfirmModal,
   EuiCallOut,
+  useGeneratedHtmlId,
 } from '@elastic/eui';
 
 import type {
@@ -98,13 +99,22 @@ export const EditModelSnapshotFlyout: FC<Props> = ({ snapshot, job, closeFlyout
     setDeleteModalVisible(false);
   }
 
+  const flyoutTitleId = useGeneratedHtmlId({
+    prefix: 'editModelSnapshotFlyout',
+  });
+
   return (
     <>
-      <EuiFlyout onClose={closeWithoutReload} hideCloseButton size="m">
+      <EuiFlyout
+        onClose={closeWithoutReload}
+        hideCloseButton
+        size="m"
+        aria-labelledby={flyoutTitleId}
+      >
         <EuiFlyoutBody>
           <EuiFlexItem>
             <EuiTitle size="s">
-              <h5>
+              <h5 id={flyoutTitleId}>
                 <FormattedMessage
                   id="xpack.ml.editModelSnapshotFlyout.title"
                   defaultMessage="Edit snapshot {ssId}"