feat(Telegram Node): Add support for local bot api server (#8437)

Co-authored-by: Jonathan Bennetts <jonathan.bennetts@gmail.com>

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

@@ -17,11 +17,18 @@ export class TelegramApi implements ICredentialType {
 			description:
 				'Chat with the <a href="https://telegram.me/botfather">bot father</a> to obtain the access token',
 		},
+		{
+			displayName: 'Base URL',
+			name: 'baseUrl',
+			type: 'string',
+			default: 'https://api.telegram.org',
+			description: 'Base URL for Telegram Bot API',
+		},
 	];
 
 	test: ICredentialTestRequest = {
 		request: {
-			baseURL: '=https://api.telegram.org/bot{{$credentials.accessToken}}',
+			baseURL: '={{$credentials.baseUrl}}/bot{{$credentials.accessToken}}',
 			url: '/getMe',
 		},
 	};