generate: cleanup and test filtering #34

Job	Run time
xtask test & lint	2m 0s
test (windows-2022, cargo-gpu)	12m 16s
test (ubuntu-24.04, cargo-gpu)	7m 35s
test (ubuntu-24.04, spirv-builder)	5m 48s
lint (spirv-builder)	5m 54s
test (windows-2022, spirv-builder)	9m 20s
lint (cargo-gpu)	7m 2s
test (macOS-latest, cargo-gpu)	8m 9s
test (macOS-latest, spirv-builder)	8m 51s
test_success	4s
	1h 6m 59s

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