[Synthetics] For lens embeddable apply styling workaround for panel b…

…order !! (#198270)

## Summary

Fixes #198273

For lens embeddable apply styling workaround for panel border !!

<img width="1726" alt="image"
src="https://github.com/user-attachments/assets/df2bcc4c-d069-44a7-99c3-59696566a6b3">

x-pack/plugins/observability_solution/exploratory_view/public/components/shared/exploratory_view/embeddable/embeddable.tsx

@@ -288,5 +288,8 @@ const Wrapper = styled.div<{
       right: 50%;
       transform: translate(50%, -50%);
     }
+    .embPanel {
+      outline: none;
+    }
   }
 `;