Reduce verbosity of test suites

[kyri-petrou]

Currently the test suites print A LOT of stuff which is confusing and makes it difficult to track down errors. WIth this PR we reduce that verbosity by removing a lot of unnecessary debug / println statements, and by using the silent and silentLogging test aspects.

Note that I can't seem to manage to get rid of all of them, netty seems to be printing some warnings under the hood which I can't figure out a way to disable, e.g.,

WARNING: events[0]=[85, -1] had no channel!
July 26, 2024 12:38:21 PM io.netty.channel.kqueue.KQueueEventLoop processReady
WARNING: events[1]=[124, -1] had no channel!
July 26, 2024 12:38:21 PM io.netty.channel.kqueue.KQueueEventLoop processReady
WARNING: events[0]=[81, -1] had no channel!
July 26, 2024 12:38:21 PM io.netty.channel.kqueue.KQueueEventLoop processReady
WARNING: events[1]=[83, -1] had no channel!
July 26, 2024 12:38:21 PM io.netty.channel.kqueue.KQueueEventLoop processReady
WARNING: events[0]=[85, -1] had no channel!

If anyone has an idea on how to disable those as well that would be great!