Fix parsing of labels.json when generating stats

The structure of the labels.json used in unit tests is not up to date. There is no "text" key anymore.

{
    "split_name": {
        "path/to/image1": "label",
        ...
    }
}

added P2 Quick Win labels

assigned to @yschneider

added 3 commits

• 5c37875f - 1 commit from branch main
• 7e0deae1 - WIP: fix parsing of labels.json
• e8a04cb1 - Update unit test

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marked this merge request as ready

requested review from @mblanco

resolved all threads

added 1 commit

• cea0e840 - Apply 1 suggestion(s) to 1 file(s)

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enabled an automatic merge when the pipeline for cea0e840 succeeds

merged