[QA] Dataset label is missing for uploaded datasets

# Problem description

On the experiment result page, the dataset label is not shown. Instead, the name of the uploaded file is listed. This makes it harder to distinguish results if generic file names are used. Examples:
* https://gerbil-qa.aksw.org/gerbil/experiment?id=202509090001
* https://gerbil-qa.aksw.org/gerbil/experiment?id=202509080002

Open the two linked experiment result pages and compare the displayed dataset label with the uploaded filename. Trace the experiment result page to find where that value is rendered. Done means uploaded datasets show their dataset label rather than only the file name, while other result information remains unchanged.

Written by the indexing model from the issue text.