Reduce coverage uploads to ease on codecov service

[PVince81]

Currently the codecov service is broken and reports cannot be opened for any PRs.
Am already in talk with codecov support.

From looking at drone.yml it seems we're uploading 13 coverage reports for every commit, and this might be triggering some API quota issues on their side.

Now I wonder if we really need that many reports ?
Or is there a way to combine them to reduce the number of uploads ?

It does look like the problem might have started after we moved everything from Travis to Drone. It is also possible that we increased the number of coverage uploads over a few months.

I haven't digged in exact history as I haven't been able to easily find old PRs where codecov still worked. Well, at least this one seemed to work: #29136 (comment)

@DeepDiver1975 @phil-davis @individual-it @patrickjahns

[ownclouders]

GitMate.io thinks the contributor most likely able to help you is @phil-davis.

Possibly related issues are #30206 (Use codecov bash to upload coverage information), #30675 (Add JS coverage to codecov), #18166 (Upload deduplication), #18111 ([feat] Upload from URL), and #13597 (Votre dossier de données et vos fichiers sont probablement accessibles depuis internet. Le fichier .htaccess ne fonctionne pas. Nous vous recommandons vivement de configurer votre serveur web de façon à ce que ce dossier de données ne soit plus accessible, ou bien de le déplacer à l'extérieur de la racine du serveur web. ).