[FLINK-12458][network] Introduce PartitionConnectionException for unreachable producer
If the consumer can not establish a connection to remote task executor while requesting remote subpartition, which might indicate the remote task executor is not reachable. We could wrap this connection exception into new proposed PartitionConnectionException which also extends PartitionException, then the job master would decide whether to restart the upstream region to re-producer partition data. This closes #8509.
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