scx_rustland fixes and improvements #1585

Job	Run time
build-kernel	12s
lint	14s
pages	0s
layered-matrix (scx_layered, --disable-topology=false)	2m 55s
rust-test-core (scx_loader)	4m 18s
layered-matrix (scx_layered, --disable-topology=true)	2m 50s
rust-test-core (scx_rustland_core)	7m 54s
integration-test (scx_bpfland)	3m 17s
rust-test-core (scx_stats)	2m 57s
integration-test (scx_lavd)	3m 50s
rust-test-core (scx_utils)	8m 46s
integration-test (scx_layered)	3m 43s
rust-test-schedulers (scx_bpfland)	8m 30s
integration-test (scx_rlfifo)	2m 46s
rust-test-schedulers (scx_lavd)	8m 43s
rust-test-schedulers (scx_layered)	8m 36s
integration-test (scx_rustland)	3m 19s
integration-test (scx_rusty)	3m 32s
rust-test-schedulers (scx_rlfifo)	9m 7s
rust-test-schedulers (scx_rustland)	10m 8s
rust-test-schedulers (scx_rusty)	8m 47s
	1h 44m 24s

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