test(telegram): update polling builders for admission wiring

The polling lifecycle doubles predate ApplicationBuilder.application_class.
Add the fluent method so their existing progress and reconnect assertions
exercise connect again; production behavior is unchanged.

tests/gateway/test_telegram_polling_progress.py

@@ -65,6 +65,9 @@ class _LifecycleBuilder:
     def token(self, _token):
         return self
 
+    def application_class(self, _application_class, _kwargs=None):
+        return self
+
     def request(self, _request):
         return self
 
@@ -413,6 +416,9 @@ async def test_general_request_success_cannot_record_polling_progress(monkeypatc
         def token(self, _token):
             return self
 
+        def application_class(self, _application_class, _kwargs=None):
+            return self
+
         def request(self, request):
             self.general_request = request
             return self