test: add boundary test for null array in ArrayUtils.contains

[Rakesh40520]

Summary

Adds a JUnit unit test testContainsNullArrayBoundary in ArrayUtilsTest to verify that ArrayUtils.contains((Object[]) null, ...) safely returns false without throwing a NullPointerException.

Motivation

Ensures boundary condition coverage for null array parameters in ArrayUtils.

[garydgregory]

Closing, duplicates testContains(). @Rakesh40520 Please check existing tests before you push to avoid wasting a maintainer's time.

[Rakesh40520]

Thank you for the feedback! My apologies for missing the existing test cases . I will thoroughly check existing test coverage before submitting in the future