Upload Test.xml to the location expected by the frontend
This MR changes the destination of the Test.xml to match https://gitlab.cern.ch/lhcb-core/lb-nightly-builds-frontend/-/blob/master/lb/nightly/frontend/api.py#L235-243.
Although, I'm not sure if https://gitlab.cern.ch/lhcb-core/lb-nightly-builds-frontend/-/blob/master/lb/nightly/frontend/api.py#L240 should rather read:
doc["tests"][platform][project]["artifact"]
Edited by Maciej Pawel Szymanski