Replace StringUtils + Partially cleanup FileUtils + Fix unit test #8688
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Having two StringUtils classes is confusing and not necessary since Apache's StringUtils provides all used functionality.
As for FileUtils; Apache commons.io contains a FileUtils class that can replace the copy / listFiles / delete methods, but some of these methods account for
SOURCE_CONTROL_FOLDERS
, which would make the current FileUtils implementation better if theseSOURCE_CONTROL_FOLDERS
actually exist in more than one use case.The overall goal of this PR is to make the source code cleaner and more efficient without making functional changes.