Setup "debugging" and misc cleanup #584

Job	Run time
lint	19s
build-kernel	13m 35s
pages	0s
rust-test-core (scx_loader)	4m 17s
rust-test-schedulers (scx_bpfland)	8m 8s
rust-test-core (scx_rustland_core)	8m 25s
integration-test (scx_bpfland)	4m 45s
rust-test-schedulers (scx_lavd)	9m 23s
rust-test-core (scx_stats)	3m 14s
integration-test (scx_lavd)	3m 40s
rust-test-schedulers (scx_layered)	8m 39s
rust-test-core (scx_utils)	9m 30s
rust-test-schedulers (scx_rlfifo)	9m 57s
integration-test (scx_layered)	4m 13s
rust-test-schedulers (scx_rustland)	10m 55s
integration-test (scx_rlfifo)	3m 49s
rust-test-schedulers (scx_rusty)	9m 28s
integration-test (scx_rustland)	3m 23s
integration-test (scx_rusty)	3m 25s
	1h 59m 5s

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