Radient: make material asset creation instance-based #3038

Job	Run time
Linux -> Pre-checks	20s
Linux -> Clang-x64, Debug	12m 24s
Linux -> Clang-TSAN-x64, RelWithDebInfo	18m 8s
Linux -> GCC-x64, Debug	13m 1s
Linux -> Clang-ASAN-x64, RelWithDebInfo	19m 29s
Linux -> Clang-x64, Release	13m 0s
Linux -> GCC-x64, Release	12m 57s
	1h 29m 19s

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