Remove workaround for TimestampNTZType in TestHelpers

[nastra]

Apache Iceberg version

1.7.1 (latest release)

Query engine

Spark

Please describe the bug 🐞

Once https://issues.apache.org/jira/browse/SPARK-50624 has been released, the workaround in

iceberg/spark/v3.5/spark/src/test/java/org/apache/iceberg/spark/data/TestHelpers.java

Lines 787 to 791 in cd187c5

	// ColumnarRow.get doesn't support TimestampNTZType, causing tests to fail. the representation
	// is identical to TimestampType so this uses that type to validate.
	if (type instanceof TimestampNTZType) {
	type = TimestampType$.MODULE$;
	}

can be removed

Willingness to contribute

• I can contribute a fix for this bug independently
• I would be willing to contribute a fix for this bug with guidance from the Iceberg community
• I cannot contribute a fix for this bug at this time