CometShuffleExchangeExec logical link is different to Spark ShuffleExchangeExec #323

Describe the bug

Enabling columnar shuffle by default PR #250 causes a lot of test failures in Spark org.apache.spark.sql.execution.adaptive.AdaptiveQueryExecSuite.

This is a tricky bug.

I found that it is because Comet sets incorrect logical link to CometShuffleExchangeExec. Because logical link is used in Spark AQE framework to do query planning, incorrect logical links cause test failures there.

Steps to reproduce

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Expected behavior

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Additional context

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