Insufficient ubuntu2004-small hosts for WiredTiger project

The WiredTiger develop project saw a large amount of system failures in our Ubuntu 20.04 Stress tests variant on the latest commit, and checking some older passing tasks we're also seeing a lot of system failures even when the job passes.

We recently saw this for ARM hosts in EVG-17570 where we fixed the issue by changing provider type for the distro to on-demand. Could we consider the same for ubuntu2004-small?

If there's a better host to use for these tests I'd also be happy to look into making that change for WiredTiger.