scx_rustland_core: re-introduce ops.update_idle() #6348

Job	Run time
lint	6s
pages	0s
build-kernel	15s
integration-test (scx_bpfland)	3m 38s
rust-test-core (scx_loader)	5m 20s
integration-test (scx_lavd)	4m 8s
rust-test-schedulers (scx_bpfland)	10m 16s
rust-test-core (scx_rustland_core)	8m 54s
rust-test-schedulers (scx_lavd)	10m 42s
integration-test (scx_layered)	4m 28s
layered-matrix (scx_layered, --disable-topology=false)	3m 33s
rust-test-core (scx_stats)	3m 27s
integration-test (scx_rlfifo)	3m 16s
rust-test-schedulers (scx_layered)	9m 47s
layered-matrix (scx_layered, --disable-topology=false, --disable-antistall)	3m 16s
rust-test-core (scx_utils)	9m 15s
integration-test (scx_rustland)	3m 55s
rust-test-schedulers (scx_rlfifo)	10m 57s
layered-matrix (scx_layered, --disable-topology=true)	3m 34s
integration-test (scx_rusty)	4m 18s
layered-matrix (scx_layered, --disable-topology=true, --disable-antistall)	4m 1s
rust-test-schedulers (scx_rustland)	11m 25s
rust-test-schedulers (scx_rusty)	9m 35s
	2h 8m 6s

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