cleanup stale files #187

Job	Run time
publish (dry-run)	21s
feature-matrix / Generate feature matrix	13s
test accelsim ()	1m 31s
test accelsim-sim ()	7m 50s
test accelsim-sim (upstream)	8m 43s
test accelsim-trace ()	6m 41s
test accelsim-trace (upstream)	6m 49s
test casimu ()	3m 58s
test casimu (python)	4m 32s
test invoke-trace ()	9m 16s
test playground ()	3m 54s
test playground-sys ()	2m 59s
test playground-sys (parallel)	3m 34s
test plot ()	1m 11s
test profile ()	1m 26s
test stats ()	37s
test trace ()	7m 16s
test trace (parallel)	7m 7s
test trace-model ()	26s
test utils ()	48s
test validate ()	15m 1s
test validate (remote)	15m 54s
test xtask ()	1m 21s
	1h 51m 28s

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