This PR adds scrollbar to extensions page. 

For now haven't added setting to hide or configure this scrollbar, can
be handled later.

<img width="1258" alt="image"
src="https://github.com/user-attachments/assets/0d260051-5e4a-4e3f-9738-b5c5a988419e"
/>


Release Notes:

- Added scrollbar to extensions page.