Add kernelCTF CVE-2024-56770_cos_mitigation #1272

Job	Run time
structure_check	14s
exploit_build (cos-109-17800.372.38)	18s
exploit_build_debug (mitigation-v3b-6.1.55)	19s
exploit_build (mitigation-v3b-6.1.55)	24s
exploit_build_debug (cos-109-17800.372.38)	16s
exploit_repro (cos-109-17800.372.38)	1m 42s
exploit_repro (mitigation-v3b-6.1.55)	1m 55s
backup_artifacts	6s
	5m 14s

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