Re-enable c sharp arrow flight integration test (apache#6611)

Author: alamb

.github/workflows/integration.yml

@@ -60,8 +60,7 @@ jobs:
       ARROW_RUST_EXE_PATH: /build/rust/debug
       BUILD_DOCS_CPP: OFF
       ARROW_INTEGRATION_CPP: ON
-      # Disable C# integration tests due to https://github.com/apache/arrow-rs/issues/6577
-      ARROW_INTEGRATION_CSHARP: OFF
+      ARROW_INTEGRATION_CSHARP: ON
       ARROW_INTEGRATION_GO: ON
       ARROW_INTEGRATION_JAVA: ON
       ARROW_INTEGRATION_JS: ON

arrow-integration-testing/src/flight_server_scenarios/integration_test.rs

@@ -48,9 +48,13 @@ type Result<T = (), E = Error> = std::result::Result<T, E>;
 /// Run a scenario that tests integration testing.
 pub async fn scenario_setup(port: u16) -> Result {
     let addr = super::listen_on(port).await?;
+    let resolved_port = addr.port();
 
     let service = FlightServiceImpl {
-        server_location: format!("grpc+tcp://{addr}"),
+        // See https://github.com/apache/arrow-rs/issues/6577
+        // C# had trouble resolving addressed like 0.0.0.0:port
+        // server_location: format!("grpc+tcp://{addr}"),
+        server_location: format!("grpc+tcp://localhost:{resolved_port}"),
         ..Default::default()
     };
     let svc = FlightServiceServer::new(service);