Infer apiVersion from `KUBERNETES_EXEC_INFO` environment variable #1748

Job	Run time
generate	30s
test	37s
integration-test (ubuntu-latest)	31s
integration-test (macos-latest)	15s
integration-test (windows-latest)	1m 8s
check / lint	30s
check / fmt	10s
check / tidy	11s
	3m 52s

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