Enable race detection for CI and fix race bug #429

Job	Run time
HAProxy check commit message	6s
generate-specification	1m 4s
generate-models	2m 6s
golangci-lint	3m 50s
lint-spec	11s
go mod tidy	9s
Build	40s
Tests	4m 39s
e2e on HAProxy (2.1)	1m 14s
e2e on HAProxy (2.2)	3m 36s
e2e on HAProxy (2.3)	3m 23s
e2e on HAProxy (2.4)	57s
e2e on HAProxy (2.5)	1m 5s
e2e on HAProxy (2.6)	1m 12s
e2e on HAProxy (2.7)	43s
e2e on HAProxy (2.8)	42s
	25m 37s

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