Change dataprep system tests assets

[MrGeorgeOwl]

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^ Add meaningful description above

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[boring-cyborg[bot]]

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[bhirsz]

@MrGeorgeOwl Please rebase the PR (and resolve comments if they are resolved)

[potiuk]

Conflicts need to be solved after strings normalisation

[potiuk]

eh.. conflicts again

[lwyszomi]

@potiuk all conflicts were resolved 😄