Fix outputs constantly focusing on new output (#5959)

- Only scroll if it's the 1st output, not for subsequent ones
- Otherwise can't use notebook while a cell is running & regularly updating the outputs

src/sql/workbench/parts/notebook/models/cell.ts

@@ -402,7 +402,9 @@ export class CellModel implements ICellModel {
 			// deletes transient node in the serialized JSON
 			delete output['transient'];
 			this._outputs.push(this.rewriteOutputUrls(output));
-			this.fireOutputsChanged(true);
+			// Only scroll on 1st output being added
+			let shouldScroll = this._outputs.length === 1;
+			this.fireOutputsChanged(shouldScroll);
 		}
 	}