[Improvement] Log message should indicate RPC error during after close / shutdown

[EnricoMi]

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• I agree to follow this project's Code of Conduct

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• I have searched in the issues and found no similar issues.

What would you like to be improved?

Some async calls may not have finished when ShuffleWriteClientImpl.close() / RegisterHeartBeat.shutdown() is called, which creates warnings in the log. This pollutes logs and makes tracing unrelated issues harder:

WARN impl.ShuffleWriteClientImpl: Error happened when unregistering to ShuffleServerInfo{host[10.109.9.45], grpc port[19999]}
io.grpc.StatusRuntimeException: CANCELLED: Thread interrupted
        at io.grpc.stub.ClientCalls.toStatusRuntimeException(ClientCalls.java:268)
        at io.grpc.stub.ClientCalls.getUnchecked(ClientCalls.java:249)
        at io.grpc.stub.ClientCalls.blockingUnaryCall(ClientCalls.java:167)
        at org.apache.uniffle.proto.ShuffleServerGrpc$ShuffleServerBlockingStub.unregisterShuffleByAppId(ShuffleServerGrpc.java:772)
        at org.apache.uniffle.client.impl.grpc.ShuffleServerGrpcClient.doUnregisterShuffleByAppId(ShuffleServerGrpcClient.java:345)
        at org.apache.uniffle.client.impl.grpc.ShuffleServerGrpcClient.unregisterShuffleByAppId(ShuffleServerGrpcClient.java:352)
        at org.apache.uniffle.client.impl.ShuffleWriteClientImpl.lambda$unregisterShuffle$28(ShuffleWriteClientImpl.java:1020)
        at org.apache.uniffle.common.util.ThreadUtils.lambda$executeTasks$0(ThreadUtils.java:110)
        at java.base/java.util.concurrent.FutureTask.run(Unknown Source)
        at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
        at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
        at java.base/java.lang.Thread.run(Unknown Source)
Caused by: java.lang.InterruptedException
        at io.grpc.stub.ClientCalls$ThreadlessExecutor.throwIfInterrupted(ClientCalls.java:750)
        at io.grpc.stub.ClientCalls$ThreadlessExecutor.waitAndDrain(ClientCalls.java:718)
        at io.grpc.stub.ClientCalls.blockingUnaryCall(ClientCalls.java:159)
        ... 9 more

How should we improve?

Once close and shutdown has been called, ongoing async calls are expected to fail, so the log message should indicate this.

Are you willing to submit PR?

• Yes I am willing to submit a PR!