BUG/MINOR: add last_chk in stats #535

Job	Run time
generate-models	1m 7s
generate-specification	48s
HAProxy check commit message	0s
golangci-lint	1m 1s
license-check	15s
Build	25s
go mod tidy	10s
lint-spec	6s
Tests	2m 25s
e2e on HAProxy (2.1)	41s
e2e on HAProxy (2.2)	44s
e2e on HAProxy (2.3)	43s
e2e on HAProxy (2.4)	40s
e2e on HAProxy (2.5)	42s
e2e on HAProxy (2.6)	40s
e2e on HAProxy (2.7)	42s
e2e on HAProxy (2.8)	39s
	11m 48s

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