Support exporting plain stack output values (#1541) #3389

Job	Run time
Lint pkg	1m 26s
prerequisites	2m 32s
test_integrations (stack-reference)	1m 38s
test_integrations (stack-transformation)	1m 4s
test_templates	3m 19s
go-tests	8m 0s
test_integrations (adopt-into-component)	1m 20s
examples (aws-java-eks-minimal)	2m 16s
test_integrations (rename)	1m 30s
examples (aws-java-webserver)	1m 51s
test_integrations (rename-component)	1m 7s
examples (aws-native-java-s3-folder)	2m 8s
test_integrations (rename-component-and-child)	1m 7s
examples (azure-java-appservice-sql)	1m 40s
test_integrations (retype-component)	1m 37s
examples (azure-java-static-website)	2m 2s
test_integrations (retype-parents)	1m 32s
examples (gcp-java-gke-hello-world)	1m 47s
examples (kubernetes)	1m 34s
examples (minimal)	1m 45s
examples (minimalsbt)	1m 47s
examples (random)	1m 35s
	44m 37s

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