spamming terminals deprive other ws channels

[akosyakov]

We've noticed that opening theia repo in Gitpod is not always stable because of terminal spamming big messages trying to pull debug adapter for @theia/java extension. Yarn seems to keep updating the whole content of the shell with quite long messages. It has bad side effect that other channels don't have chance to send their messages.

Not sure how we can handle it, maybe reorder messages send in the same tick somehow. For the beginning it would be good to come up with the shell script reproducing the issue in local environment.