[VL] BuildSideRelation supports transforms for all scenarios

[yikf]

Backend

VL (Velox)

Bug description

If exchange reuse, the buildKeys of ColumnarSubqueryBroadcastExec and the buildKeys of BroadcastExchangeExec may not be the same, making it difficult to construct the projection of the transform. therefore, the BuildSideRelation should retain the BroadcastMode of BroadcastExchangeExec to simplify the projection of the transform.

Spark version

None

Spark configurations

No response

System information

No response

Relevant logs

No response

[philo-he]

Assume this is relevant to this discussion: #7807.