CI timeouts on consuming apps

[steveszc]

In large apps with very large heapsnapshots, CI builds are timing out, even after memory leak detection results show up in the build/test CI logs. Unclear what is going on, but in these cases it can take several minutes for the heap snapshot to be parsed. There may be a timeout somewhere in testem config or similar that needs to be increased. I've been able to replicate these timeouts/unfinished test runs locally on the app in question, so its likely something with testem.

Whatever is determined to be causing the test timeouts should be documented.