[Streams] Wrap "create partition" buttons on small screens (elastic#240957)

Tiny PR ensuring create partition buttons get wrapped on small screens

## Before

<img width="1406" height="1103" alt="Screenshot 2025-10-28 at 10 27 31"
src="https://github.com/user-attachments/assets/0a3e9a99-f396-42fc-98a2-5e7ffdb116e3"
/>

## After

<img width="1409" height="1105" alt="Screenshot 2025-10-28 at 10 27 50"
src="https://github.com/user-attachments/assets/72cf281e-e27f-44b9-88e3-b3e5f436ab52"
/>

Author: thomheymann

x-pack/platform/plugins/shared/streams_app/public/components/data_management/stream_detail_routing/child_stream_list.tsx

@@ -106,6 +106,7 @@ export function ChildStreamList({ availableStreams }: { availableStreams: string
             flex-grow: 1;
             min-height: 80px;
           `}
+          wrap
         >
           {aiFeatures && aiFeatures.enabled && (
             <EuiFlexItem grow={false}>