ci/iris: Disable blender-demo-cube_diorama on APL.

It has timed out on 3 jobs today.

Fixes: 96f0944a ("ci/panfrost: add Blender, Warzone2100, Freedoom and Unvanquished traces")
Part-of: <!17041>
75 jobs for !17041 with ci-apl in 48 minutes and 23 seconds (queued for 16 seconds)
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