New script to gather all the information about failures in regular jobs

This script just looks for all the failures (by default in regular jobs, aka, W & S), extracting as much information as possible for further processing by other tools.

It generates a .json file.

I've it working since a few days ago @

https://ci.moodle.org/view/maintenance/job/MAINT%20-%20AUTO%20-%20Gather%20failures%20Information/

You can see the generated files there, it seems to be working ok, so far.

Note this is the first half of work towards automating completely the handling of random failures (the devpad maintenance).

Ciao :-)

PS: Also, added some bits to gradle, needed for the tests to pass.