Modernise root resource handling #3186

Job	Run time
prerequisites	5m 44s
Lint pkg	4m 5s
test_integrations (stack-reference)	2m 5s
go-tests	5m 22s
examples (aws-java-eks-minimal)	3m 40s
test_integrations (stack-transformation)	1m 53s
test_templates	8m 32s
examples (aws-java-webserver)	2m 58s
test_integrations (adopt-into-component)	2m 6s
examples (aws-native-java-s3-folder)	3m 5s
test_integrations (rename)	2m 18s
examples (azure-java-appservice-sql)	2m 39s
test_integrations (rename-component)	2m 16s
examples (azure-java-static-website)	3m 0s
test_integrations (rename-component-and-child)	2m 7s
examples (gcp-java-gke-hello-world)	3m 10s
test_integrations (retype-component)	2m 16s
examples (kubernetes)	4m 38s
test_integrations (retype-parents)	2m 19s
examples (minimal)	3m 4s
examples (minimalsbt)	2m 59s
examples (random)	2m 47s
	1h 13m 3s

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