[BUG] Spark-4.0: Tests failures in WindowFunctionSuite

[nartal1]

Describe the bug
Below unit tests(scala tests) are failing in WindowFunctionSuite
Total test failures: 27

Pasting the error message which have different reasons for the failure.

1. - [Window] [ROWS] [-2, 3]  *** FAILED ***
  java.lang.IllegalArgumentException: Part of the plan is not columnar class org.apache.spark.sql.execution.window.WindowExec

2. - [Window] [ROWS] [-2, CURRENT ROW]  *** FAILED ***
  org.apache.spark.SparkArithmeticException: [NUMERIC_VALUE_OUT_OF_RANGE.WITH_SUGGESTION]  382735532879176426 cannot be represented as Decimal(18, 1). If necessary set "spark.sql.ansi.enabled" to "false" to bypass this error, and return NULL instead. SQLSTATE: 22003
== DataFrame ==
"cast" was called from
com.nvidia.spark.rapids.WindowFunctionSuite.$anonfun$windowAggregationTesterForDecimal$1(WindowFunctionSuite.scala:56)

3. - [Window] [ROWS] [UNBOUNDED PRECEDING, CURRENT ROW] [NO PART] *** FAILED ***
  java.lang.IllegalArgumentException: Part of the plan is not columnar class org.apache.spark.sql.execution.window.WindowExec

Needs further investigation why WindowExec is not running on GPU. We need to check if disabling ANSI mode fixes some of the test failures.

Steps/Code to reproduce bug

mvn package -f scala2.13/pom.xml -pl tests -am -Dbuildver=400 -Dsuffixes=".*WindowFunctionSuite"

Expected behavior
Tests must either pass or skip with valid reason in the test suite.