ci/radeonsi: Skip really slow tests on stoney
These allocate way more memory than is reasonable, a bunch of times. I'd guess they pushed the machine pretty deep into memory pressure which is why it was all taking like 3 minutes.
Due to an influx of spam, we have had to impose restrictions on new accounts. Please see this wiki page for instructions on how to get full permissions. Sorry for the inconvenience.
These allocate way more memory than is reasonable, a bunch of times. I'd guess they pushed the machine pretty deep into memory pressure which is why it was all taking like 3 minutes.