Reduce logging in tests

For now this is fine. Make this better later. Turns out it logs from
both the Gouda logger and the ActiveJob logger. Next step would be to
merge those. And we still have missing test assertions in the databse
setup methods. Something that is also not too pressing atm.

test/gouda/test_helper.rb

@@ -23,6 +23,8 @@ def self.adapter
     @adapter || Gouda::Adapter.new
     @case_random = Random.new(Minitest.seed)
     Gouda::Railtie.initializers.each(&:run)
+    ActiveJob::Base.logger = nil
+    Gouda.config.logger.level = 4
   end
 
   teardown do