feat(Slack Node): Add blocks to slack message update (#2182)

* Adding blocks to slack message update

* Fixing lint

* Adding blocks to slack message update

* Fixing lint

* ⚡ added toggle to display json inputs in update operation

* ⚡ Improvements

* feat(Markdown Node): Add new node to covert between Markdown <> HTML (#1728)

* ✨ Markdown Node

* Tweaked wording

* ⬆️ Bump showdown to latest version

* ⚡ Small improvement

* 👕 Fix linting issue

* ⚡ Small improvements

* 🔨 added options, added continue on fail, some clean up

* ⚡ removed test code

* ⚡ added missing semicolumn

* 🔨 wip

* 🔨 replaced library for converting html to markdown, added options

* ⚡ lock file fix

* 🔨 clean up

Co-authored-by: sirdavidoff <1670123+sirdavidoff@users.noreply.github.com>
Co-authored-by: Michael Kret <michael.k@radency.com>

Co-authored-by: Michael Kret <michael.k@radency.com>
Co-authored-by: ricardo <ricardoespinoza105@gmail.com>
Co-authored-by: Ricardo Espinoza <ricardo@n8n.io>
Co-authored-by: sirdavidoff <1670123+sirdavidoff@users.noreply.github.com>
Co-authored-by: Jan Oberhauser <jan.oberhauser@gmail.com>

packages/nodes-base/credentials/SlackApi.credentials.ts

@@ -1,9 +1,11 @@
 import {
+	IAuthenticateBearer,
+	IAuthenticateQueryAuth,
+	ICredentialTestRequest,
 	ICredentialType,
 	INodeProperties,
 } from 'n8n-workflow';
 
-
 export class SlackApi implements ICredentialType {
 	name = 'slackApi';
 	displayName = 'Slack API';
@@ -17,4 +19,26 @@ export class SlackApi implements ICredentialType {
 			required: true,
 		},
 	];
+	authenticate: IAuthenticateBearer = {
+		type: 'bearer',
+		properties: {
+			tokenPropertyName: 'accessToken',
+		},
+	};
+	test: ICredentialTestRequest = {
+		request: {
+			baseURL: 'https://slack.com',
+			url: '/api/users.profile.get',
+		},
+		rules: [
+			{
+				type: 'responseSuccessBody',
+				properties: {
+					key: 'ok',
+					value: false,
+					message: 'Invalid access token',
+				},
+			},
+		],
+	};
 }