feat(core): Add optional Error-Output (#7460)

Add an additional optional error output to which all items get sent that
could not be processed.
![Screenshot from 2023-10-18
17-29-15](https://github.com/n8n-io/n8n/assets/6249596/e9732807-ab2b-4662-a5f6-bdff24f7ad55)

Github issue / Community forum post (link here to close automatically):
https://community.n8n.io/t/error-connector-for-nodes/3094

https://community.n8n.io/t/error-handling-at-node-level-detect-node-execution-status/26791

---------

Co-authored-by: OlegIvaniv <me@olegivaniv.com>

packages/core/src/NodeExecuteFunctions.ts

@@ -2289,7 +2289,13 @@ export function getNodeParameter(
  *
  */
 export function continueOnFail(node: INode): boolean {
-	return get(node, 'continueOnFail', false);
+	const onError = get(node, 'onError', undefined);
+
+	if (onError === undefined) {
+		return get(node, 'continueOnFail', false);
+	}
+
+	return ['continueRegularOutput', 'continueErrorOutput'].includes(onError);
 }
 
 /**