fix(vega): fixed vega editor search not working (opensearch-project#10937)

* fix(vega): fixed vega editor search not working

fixed opensearch-project#9457

Signed-off-by: Yulong Ruan <[email protected]>

* Changeset file for PR opensearch-project#10937 created/updated

---------

Signed-off-by: Yulong Ruan <[email protected]>
Co-authored-by: opensearch-changeset-bot[bot] <154024398+opensearch-changeset-bot[bot]@users.noreply.github.com>

Author: ruanyl

changelogs/fragments/10937.yml

@@ -0,0 +1,2 @@
+fix:
+- Vega visualization editor search not working ([#10937](https://github.com/opensearch-project/OpenSearch-Dashboards/pull/10937))

src/plugins/vis_type_vega/public/components/vega_vis_editor.tsx

@@ -33,6 +33,7 @@ import { EuiCodeEditor } from '@elastic/eui';
 import compactStringify from 'json-stringify-pretty-compact';
 import hjson from 'hjson';
 import 'brace/mode/hjson';
+import 'brace/ext/searchbox';
 import { i18n } from '@osd/i18n';
 
 import { VisOptionsProps } from 'src/plugins/vis_default_editor/public';