glmark2: Switch pulsar to apitrace.

This was done with vblank_mode=3 (to capture fewer frames per unit
time) and taking frame 30 using gltrim.  Bigger than the .rdc, but
should be much faster to run.

Part-of: <gfx-ci/tracie/traces-db!33>
3 jobs for glmark2 in 5 minutes and 10 seconds (queued for 1 second)