refactor(core): Separate API response from error in execution error causes (no-changelog) (#7880)

Store the third-party API response error separately from the error
stored as `cause`

Follow-up to:
https://github.com/n8n-io/n8n/pull/7820#discussion_r1406009154

packages/workflow/src/errors/abstract/execution-base.error.ts

@@ -2,16 +2,16 @@ import type { Functionality, IDataObject, JsonObject, Severity } from '../../Int
 import { ApplicationError } from '../application.error';
 
 interface ExecutionBaseErrorOptions {
-	cause?: Error | JsonObject;
+	cause?: Error;
+	errorResponse?: JsonObject;
 }
 
 export abstract class ExecutionBaseError extends ApplicationError {
 	description: string | null | undefined;
 
-	/**
-	 * @tech_debt Ensure `cause` can only be `Error` or `undefined`
-	 */
-	cause: Error | JsonObject | undefined;
+	cause?: Error;
+
+	errorResponse?: JsonObject;
 
 	timestamp: number;
 
@@ -23,7 +23,7 @@ export abstract class ExecutionBaseError extends ApplicationError {
 
 	functionality: Functionality = 'regular';
 
-	constructor(message: string, { cause }: ExecutionBaseErrorOptions) {
+	constructor(message: string, { cause, errorResponse }: ExecutionBaseErrorOptions = {}) {
 		const options = cause instanceof Error ? { cause } : {};
 		super(message, options);
 
@@ -35,6 +35,8 @@ export abstract class ExecutionBaseError extends ApplicationError {
 		} else if (cause && !(cause instanceof Error)) {
 			this.cause = cause;
 		}
+
+		if (errorResponse) this.errorResponse = errorResponse;
 	}
 
 	// eslint-disable-next-line @typescript-eslint/no-explicit-any

packages/workflow/src/errors/abstract/node.error.ts

@@ -38,8 +38,12 @@ export abstract class NodeError extends ExecutionBaseError {
 	node: INode;
 
 	constructor(node: INode, error: Error | JsonObject) {
-		const message = error instanceof Error ? error.message : '';
-		super(message, { cause: error });
+		if (error instanceof Error) {
+			super(error.message, { cause: error });
+		} else {
+			super('', { errorResponse: error });
+		}
+
 		this.node = node;
 	}