fix(core): Add check that queue is defined and remove cyclic dependency (#7404)

In a rare edge case an undefined queue could be returned - this should
not happen and now an error is thrown.
Also using the opportunity to remove a cyclic dependency from the Queue.

packages/cli/src/WebhookHelpers.ts

@@ -160,23 +160,6 @@ export function getWorkflowWebhooks(
 	return returnData;
 }
 
-export function decodeWebhookResponse(
-	response: IExecuteResponsePromiseData,
-): IExecuteResponsePromiseData {
-	if (
-		typeof response === 'object' &&
-		typeof response.body === 'object' &&
-		(response.body as IDataObject)['__@N8nEncodedBuffer@__']
-	) {
-		response.body = Buffer.from(
-			(response.body as IDataObject)['__@N8nEncodedBuffer@__'] as string,
-			BINARY_ENCODING,
-		);
-	}
-
-	return response;
-}
-
 export function encodeWebhookResponse(
 	response: IExecuteResponsePromiseData,
 ): IExecuteResponsePromiseData {