[VL][Delta] Remove DV validation that blocks native DV scan handoff

The doValidateInternal() method from upstream was rejecting all DV scans
with 'Deletion vector is not supported in native.' This conflicts with
this branch's purpose of enabling DV support via JVM handoff.

Removed the validation to allow DV scans to proceed through the native
scan path with JVM handoff for DV processing.

This fixes test failures in DeltaInsertIntoSQLByPathSuite where DV scans
were incorrectly falling back to JVM instead of using the handoff feature.

Author: Mohammad Linjawi

gluten-delta/src/main/scala/org/apache/gluten/execution/DeltaScanTransformer.scala

@@ -84,18 +84,6 @@ case class DeltaScanTransformer(
     case _ => dataFilters
   }
 
-  override protected def doValidateInternal(): ValidationResult = {
-    if (
-      requiredSchema.fields.exists(
-        _.name == "__delta_internal_is_row_deleted") || requiredSchema.fields.exists(
-        _.name == "__delta_internal_row_index")
-    ) {
-      return ValidationResult.failed(s"Deletion vector is not supported in native.")
-    }
-
-    super.doValidateInternal()
-  }
-
   override def doCanonicalize(): DeltaScanTransformer = {
     DeltaScanTransformer(
       relation,