BUILD/MINOR: kubebuilder: add validation markers for Pattern, Minimum… #475

Job	Run time
generate-models	1m 29s
generate-specification	49s
HAProxy check commit message	0s
golangci-lint	0s
go mod tidy	0s
lint-spec	0s
Build	0s
Tests	0s
e2e on HAProxy	0s
	2m 18s

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