scx_layered: Add additional drain to fallback DSQs #2284

Job	Run time
pages	0s
build-kernel	21s
lint	23s
layered-matrix (scx_layered, --disable-topology=false)	2m 57s
rust-test-core (scx_loader)	6m 6s
integration-test (scx_bpfland)	3m 27s
layered-matrix (scx_layered, --disable-topology=true)	3m 54s
rust-test-core (scx_rustland_core)	10m 0s
integration-test (scx_lavd)	4m 36s
rust-test-core (scx_stats)	3m 42s
integration-test (scx_layered)	3m 39s
rust-test-core (scx_utils)	11m 33s
rust-test-schedulers (scx_bpfland)	10m 46s
integration-test (scx_rlfifo)	3m 28s
integration-test (scx_rustland)	4m 32s
rust-test-schedulers (scx_lavd)	11m 23s
integration-test (scx_rusty)	3m 44s
rust-test-schedulers (scx_layered)	11m 17s
rust-test-schedulers (scx_rlfifo)	12m 5s
rust-test-schedulers (scx_rustland)	12m 58s
rust-test-schedulers (scx_rusty)	11m 44s
	2h 12m 35s

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