[FEATURE] xp-clifford: xp-testing integration

[gergely-szabo-sap]

Context

xp-testing framework shall be extended.

Scope
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Out of scope
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Hint: Smaller feature wishes tend to be implemented and shipped quicker!

Technical Steps
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Workarounds & Alternatives
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Additional context
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[sdischer-sap]

@gergely-szabo-sap no content in the issue whatsoever ;)