Flink: If IcebergSink writeParallelism is not specified, defaults to the input source parallelism #13260
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…the input source parallelism
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Currently, if the writeParallelism is not specified, the IcebergSink will default to use the job parallelism.
Instead, we should default to the inputSource parallelism, to promote chaining.
This PR tracks that change, consequently bringing parity with the FlinkSink.
re: #12071 (comment)
cc: @stevenzwu @mxm @pvary @gyfora