[FEA] Support OneRowRelationExec introduced in Spark 4.1.x (SPARK-52060)

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Description

Spark 4.1.0 introduced a new OneRowRelationExec physical plan node via SPARK-52060 (commit f423885f65d).

Changes in Spark 4.1.x

1. New OneRowRelationExec class - A dedicated physical plan node for single-row relations (e.g., SELECT 1, SELECT version())

2. Replaces RDDScanExec - Previously, one-row relations used RDDScanExec with a hard-coded "OneRowRelation" string

3. User-facing change - The plan now shows OneRowRelationExec rather than RDDScanExec

Implementation

Added GpuOneRowRelationExec in spark-rapids that:

• Produces a single ColumnarBatch with 1 row and 0 columns
• Uses no GPU memory since there are no actual data columns
• Overrides makeCopy and doCanonicalize to handle Spark's TreeNode reflection

Status

✅ Completed - GPU support for OneRowRelationExec has been implemented in the spark411 shim.

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Will be closed by #14120