refactor(Peekalink Node): Stricter typing for Peekalink api call + Tests (no-changelog) (#8125)

This PR is an example for how we can
1. improve typing and remove boilerplate code in may of our nodes
2. use nock to write effective unit tests for nodes that make external
calls

## Review / Merge checklist
- [x] PR title and summary are descriptive
- [x] Add tests

packages/nodes-base/test/nodes/ExecuteWorkflow.ts

@@ -1,3 +1,4 @@
+import nock from 'nock';
 import { WorkflowExecute } from 'n8n-core';
 import type { INodeTypes, IRun, IRunExecutionData } from 'n8n-workflow';
 import { createDeferredPromise, Workflow } from 'n8n-workflow';
@@ -5,6 +6,13 @@ import * as Helpers from './Helpers';
 import type { WorkflowTestData } from './types';
 
 export async function executeWorkflow(testData: WorkflowTestData, nodeTypes: INodeTypes) {
+	if (testData.nock) {
+		const { baseUrl, mocks } = testData.nock;
+		const agent = nock(baseUrl);
+		mocks.forEach(({ method, path, statusCode, responseBody }) =>
+			agent[method](path).reply(statusCode, responseBody),
+		);
+	}
 	const executionMode = testData.trigger?.mode ?? 'manual';
 	const workflowInstance = new Workflow({
 		id: 'test',