[node-telegram-bot-api] Mark several properties on the WebHookOptions interface as optional (#35218)

* Update WebHookOptions interface in response to #35206
* Set `key`, `cert` and `pfx` within the Webhook Options to be optional values, per issue #35206
* Update definition tests to test the new changes

* Resolve lint issues with chagnes to node-telegram-bot-api

types/node-telegram-bot-api/index.d.ts

@@ -1,4 +1,4 @@
-// Type definitions for node-telegram-bot-api 0.30
+// Type definitions for node-telegram-bot-api 0.31
 // Project: https://github.com/yagop/node-telegram-bot-api
 // Definitions by: Alex Muench <https://github.com/ammuench>
 //                 Agadar <https://github.com/agadar>
@@ -78,9 +78,9 @@ declare namespace TelegramBot {
     interface WebHookOptions {
         host?: string;
         port?: number;
-        key: string;
-        cert: string;
-        pfx: string;
+        key?: string;
+        cert?: string;
+        pfx?: string;
         autoOpen?: boolean;
         https?: ServerOptions;
         healthEndpoint?: string;

types/node-telegram-bot-api/node-telegram-bot-api-tests.ts

@@ -1,6 +1,6 @@
 import TelegramBot = require('node-telegram-bot-api');
 
-const MyTelegramBot = new TelegramBot('token');
+const MyTelegramBot = new TelegramBot('token', { webHook: { host: 'myhost'}});
 
 MyTelegramBot.startPolling({restart: true});
 MyTelegramBot.stopPolling();