Create utility class for compareXml/compareTxt for refactoring purposes

[sfid98]

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• [ ] The commit message follows our guidelines
• [ ] Tests for the changes have been added (for bug fixes / features)
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Does this PR already have an issue describing the problem ? If so, link to this issue using '#XXX' and skip the rest Fix #2208

What kind of change does this PR introduce? (Bug fix, feature, docs update, ...) Refactoring