ci: enable on merge_group action #592

Job	Run time
build-kernel	16s
lint	22s
pages	0s
rust-test-schedulers (scx_bpfland)	8m 23s
rust-test-core (scx_loader)	4m 15s
rust-test-schedulers (scx_lavd)	8m 15s
integration-test (scx_bpfland)	3m 41s
rust-test-core (scx_rustland_core)	8m 6s
rust-test-schedulers (scx_layered)	8m 20s
rust-test-core (scx_stats)	2m 59s
rust-test-schedulers (scx_rlfifo)	9m 15s
rust-test-core (scx_utils)	8m 48s
integration-test (scx_lavd)	3m 36s
rust-test-schedulers (scx_rustland)	10m 6s
integration-test (scx_layered)	3m 50s
rust-test-schedulers (scx_rusty)	8m 24s
integration-test (scx_rlfifo)	3m 16s
integration-test (scx_rustland)	3m 41s
integration-test (scx_rusty)	3m 27s
	1h 39m 0s

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