In this case we are probably interested in looking at the output as it arrives in real time.
Can always be overridden on the command line if desired.
(cherry picked from commit 44a8ec11)

https://trello.com/c/NvZt4WXu/15-rawhtmlmarkupformatter

First tried using excludedGroups and trying to work around SUREFIRE-984.
Made some progress, but not ideal since marked tests are omitted from output, rather than being listed as ignored.
Throwing AssumptionViolatedException from JenkinsRule is much simpler and seems to work better.
https://github.com/junit-team/junit/issues/116 notes its limitations.