core: fix MetricRecorderImpl#metricSinks ConcurrentModificationException - #12730
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…ption (grpc#12730) ``` java.util.ConcurrentModificationException at java.base/java.util.ArrayList$Itr.checkForComodification(ArrayList.java:1013) at java.base/java.util.ArrayList$Itr.next(ArrayList.java:967) at io.grpc.internal.MetricRecorderImpl.addLongCounter(MetricRecorderImpl.java:95) at io.grpc.internal.SubchannelMetrics.recordConnectionAttemptSucceeded(SubchannelMetrics.java:82) at io.grpc.internal.InternalSubchannel$TransportListener$1.run(InternalSubchannel.java:605) at io.grpc.SynchronizationContext.drain(SynchronizationContext.java:96) at io.grpc.SynchronizationContext.execute(SynchronizationContext.java:128) at io.grpc.internal.InternalSubchannel$TransportListener.transportReady(InternalSubchannel.java:591) at io.grpc.netty.shaded.io.grpc.netty.ClientTransportLifecycleManager.notifyReady(ClientTransportLifecycleManager.java:51) ``` Fix grpc#12727
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Fix #12727