Remove cooker from `autonuke` secret #3296

Job	Run time
check-environments-deployment-plan	2m 12s
create-environment	0s
provision-workspaces	0s
delegate-access	0s
secure-baselines	0s
remove-default-vpc	0s
single-sign-on	0s
member-bootstrap	0s
environment_json_changes_notification	0s
	2m 12s

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