Create struct output for max and mean topology height

[RShaw026]

Description and Context

The function ComputeMaxAndMean has been changed, adhering to better coding practices.

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How Has This Been Tested?

ctest is working. Building successfully with BACI, and the corresponding tests are passing in my local workstation.

Checklist

• [ ] My commit messages mention the appropriate GitHub issue numbers and are longer than one line where appropriate.
• [ ] I have added/updated documentation where necessary.

Additional Information

Interested Parties / Possible Reviewers

@mayrmt