Added sanity check for trailing newlines

src/csharp/Grpc.Core.Tests/Internal/AsyncCallTest.cs

src/csharp/Grpc.Core/Internal/AsyncCall.cs

src/csharp/Grpc.Core/Internal/AsyncCallBase.cs

src/csharp/Grpc.Core/Internal/AsyncCallServer.cs

src/csharp/Grpc.Core/Internal/AsyncCompletion.cs

src/csharp/Grpc.Core/Internal/BatchContextSafeHandle.cs

src/csharp/Grpc.Core/Internal/CallSafeHandle.cs

src/csharp/Grpc.Core/Properties/AssemblyInfo.cs

src/csharp/Grpc.HealthCheck.Tests/HealthClientServerTest.cs

src/csharp/Grpc.HealthCheck/Properties/AssemblyInfo.cs

src/node/test/echo_service.proto

src/node/test/test_messages.proto

src/node/test/test_service.proto

src/proto/grpc/health/v1alpha/health.proto

test/cpp/qps/client_async.cc

test/cpp/qps/client_sync.cc

test/cpp/qps/generic_async_streaming_ping_pong_test.cc

test/cpp/qps/qps_driver.cc

test/cpp/qps/qps_worker.cc

test/cpp/qps/server_async.cc