IDEA gets super confused when you take a jar task and make it not a jar task.
These are only really used when running from CI (running `./gradlew jar` in
meta will still trigger all of the `:plugin:XXX:jar` tasks), so the names don't
matter.
Try without using gradle's parallel function (probably adds more
overhead for the tiny number of tests we have), and combine
coveralls with the main test run.