Fix too-many-pings on FnAPI runner under grpc mode (#37013)

* Fix too-many-pings on FnAPI runner under grpc mode

* Fix lints

Author: shunping

sdks/python/apache_beam/runners/portability/fn_api_runner/worker_handlers.py

@@ -465,10 +465,15 @@ def __init__(
     # received or sent over the data plane. The actual buffer size
     # is controlled in a layer above. Also, options to keep the server alive
     # when too many pings are received.
-    options = [("grpc.max_receive_message_length", -1),
-               ("grpc.max_send_message_length", -1),
-               ("grpc.http2.max_pings_without_data", 0),
-               ("grpc.http2.max_ping_strikes", 0)]
+    options = [
+        ("grpc.max_receive_message_length", -1),
+        ("grpc.max_send_message_length", -1),
+        ("grpc.http2.max_pings_without_data", 0),
+        ("grpc.http2.max_ping_strikes", 0),
+        # match `grpc.keepalive_time_ms` defined in the client
+        # (channel_factory.py)
+        ("grpc.http2.min_ping_interval_without_data_ms", 20_000),
+    ]
 
     self.state = state
     self.provision_info = provision_info