ci: enable on merge_group action #593

Job	Run time
build-kernel	11s
lint	15s
pages	0s
rust-test-core (scx_loader)	4m 47s
integration-test (scx_bpfland)	3m 3s
rust-test-schedulers (scx_bpfland)	7m 51s
rust-test-core (scx_rustland_core)	8m 13s
integration-test (scx_lavd)	3m 48s
rust-test-schedulers (scx_lavd)	8m 15s
rust-test-core (scx_stats)	2m 57s
integration-test (scx_layered)	4m 4s
rust-test-core (scx_utils)	9m 5s
rust-test-schedulers (scx_layered)	8m 18s
integration-test (scx_rlfifo)	2m 44s
rust-test-schedulers (scx_rlfifo)	9m 19s
integration-test (scx_rustland)	3m 19s
rust-test-schedulers (scx_rustland)	9m 50s
integration-test (scx_rusty)	3m 14s
rust-test-schedulers (scx_rusty)	8m 16s
	1h 37m 29s

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