ci: really, fail upcoming on scheduled builds, please
This makes it so that scheduled builds don't allow upcoming to fail, to trigger a nice notification when it happens. The earlier attempt didn't actually work. I've tested this by creating a schedule for the topic: As desired, it failed when upcoming was broken, and succeeded when fixed.
The MR also includes backports of a few CI cleanups from default.
Edited by Dan Villiom Podlaski Christiansen