Add test to files.cmake

Summary:
Add mitkImageStatisticsContainerTest.cpp

Remove CreateNodeRelationImage function

Apply naming convention

Remove unnecessary includes

Add a test to check if an existing statistic is overwritten

Adapt printTest to just check if no exception is thrown

Correct StatisticNamesTest

Add a test to check if empty container trigger an exception if GetAllStatisticNames() is called.

Extend InternalCloneTest

Expand TimeStepsTest

Add check for print function for empty container

Correct AllStatisticNamesForContainer() Test

Fix concern

Test Plan: manual

Reviewers: kalali, O1 MITK Reviewer Group I

Reviewed By: kalali, O1 MITK Reviewer Group I

Maniphest Tasks: T27297

Differential Revision: https://phabricator.mitk.org/D283