Cg2: Expose OOMGroupKill event/writes #629

Job	Run time
Project Checks	47s
Compare auto-generated Go files	25s
Cgroup V2 tests (1.22.x)	44s
Lint (1.22.x)	32s
Cgroup V1 tests (1.22.x)	3m 20s
Cgroup V1 tests (1.23.x)	3m 41s
Cgroup V2 tests (1.23.x)	46s
Lint (1.23.x)	38s
	10m 53s

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