radv: stop skipping the cache for compute/raytracing/monolithic graphics pipelines with GPL

Samuel Pitoiset requested to merge hakzsam/mesa:radv_gpl_cache_prelim into main

Only libraries and optimized (LTO) pipelines are still unsupported but other pipelines would be cached again with RADV_PERFTEST=gpl.

This will also allow to test GPL in Mesa CI soon.

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