refactor: remove usage of longpollerTimeout

Author: Vinzent03

packages/realtime_client/lib/src/realtime_client.dart

@@ -145,7 +145,7 @@ class RealtimeClient {
         },
         transport = transport ?? createWebSocketClient {
     _log.config(
-        'Initialize RealtimeClient with endpoint: $endPoint, timeout: $timeout, heartbeatIntervalMs: $heartbeatIntervalMs, longpollerTimeout: $longpollerTimeout, logLevel: $logLevel');
+        'Initialize RealtimeClient with endpoint: $endPoint, timeout: $timeout, heartbeatIntervalMs: $heartbeatIntervalMs, logLevel: $logLevel');
     _log.finest('Initialize with headers: $headers, params: $params');
     final customJWT = this.headers['Authorization']?.split(' ').last;
     accessToken = customJWT ?? params['apikey'];

packages/realtime_client/test/socket_test.dart

@@ -78,7 +78,6 @@ void main() {
         'message': [],
       });
       expect(socket.timeout, const Duration(milliseconds: 10000));
-      expect(socket.longpollerTimeout, 20000);
       expect(socket.heartbeatIntervalMs, Constants.defaultHeartbeatIntervalMs);
       expect(
         socket.logger is void Function(
@@ -99,7 +98,6 @@ void main() {
       final socket = RealtimeClient(
         'wss://example.com/socket',
         timeout: const Duration(milliseconds: 40000),
-        longpollerTimeout: 50000,
         heartbeatIntervalMs: 60000,
         // ignore: avoid_print
         logger: (kind, msg, data) => print('[$kind] $msg $data'),
@@ -116,7 +114,6 @@ void main() {
         'message': [],
       });
       expect(socket.timeout, const Duration(milliseconds: 40000));
-      expect(socket.longpollerTimeout, 50000);
       expect(socket.heartbeatIntervalMs, 60000);
       expect(
         socket.logger is void Function(