What is the problem the feature request solves?

Comet cannot accelerate ProjectExec because: Comet is not enabled

We do not need to add fallback info for spark plan node when Comet is not enabled

Comet cannot accelerate ProjectExec because: Comet Scan is not enabled

Comet Scan is not enabled fallback reason should be placed in the scan node

Comet cannot accelerate CometProjectExec because: Metadata column is not supported

ditto

Comet cannot accelerate ShuffleExchangeExec because: spark.shuffle.manager is not set to org.apache.spark.sql.comet.execution.shuffle.CometShuffleManager$

CometShuffleManager class name should be org.apache.spark.sql.comet.execution.shuffle.CometShuffleManager

Describe the potential solution

No response

Additional context

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