ci/iris: Switch GL/GLES testing to suites.
Better board utilization, less fussy load-balancing of the boards, and being able to add KHR-GLES* and multisample testing without having to add more reboots.
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Better board utilization, less fussy load-balancing of the boards, and being able to add KHR-GLES* and multisample testing without having to add more reboots.