Allows to delete specific build report from UI

[Thibault Gouala]

Reported from a user :

If you have been doing test builds for a day, then you might want to clear out the builds to only keep one, so you can compare it better

From developers :

Right now build reports can be deleted manually from the disk, but the file name being a timestamp may not be really relevant. This is an interesting request and will go to the product roadmap based on other feature priorities / other users votes etc....