fix(seven Node): Rename sms77 to seven, fix credentials test (#7180)

Github issue / Community forum post (link here to close automatically):

packages/nodes-base/nodes/Sms77/Sms77.node.ts

@@ -1,6 +1,6 @@
 import type {
-	IExecuteFunctions,
 	IDataObject,
+	IExecuteFunctions,
 	INodeExecutionData,
 	INodeType,
 	INodeTypeDescription,
@@ -10,16 +10,15 @@ import { sms77ApiRequest } from './GenericFunctions';
 
 export class Sms77 implements INodeType {
 	description: INodeTypeDescription = {
-		displayName: 'sms77',
+		displayName: 'seven',
 		name: 'sms77',
-		// eslint-disable-next-line n8n-nodes-base/node-class-description-icon-not-svg
-		icon: 'file:sms77.png',
+		icon: 'file:seven.svg',
 		group: ['transform'],
 		version: 1,
 		subtitle: '={{$parameter["operation"] + ": " + $parameter["resource"]}}',
 		description: 'Send SMS and make text-to-speech calls',
 		defaults: {
-			name: 'sms77',
+			name: 'seven',
 		},
 		inputs: ['main'],
 		outputs: ['main'],
@@ -118,7 +117,7 @@ export class Sms77 implements INodeType {
 					},
 				},
 				description:
-					'The number of your recipient(s) separated by comma. Can be regular numbers or contact/groups from Sms77.',
+					'The number of your recipient(s) separated by comma. Can be regular numbers or contact/groups from seven.',
 			},
 			{
 				displayName: 'Message',