Remove use of BaseProvider.PluginDownloadURL #3248

Job	Run time
prerequisites	2m 27s
Lint pkg	33s
test_templates	4m 35s
go-tests	6m 16s
test_integrations (stack-reference)	1m 46s
test_integrations (stack-transformation)	1m 22s
examples (aws-java-eks-minimal)	3m 6s
test_integrations (adopt-into-component)	1m 58s
examples (aws-java-webserver)	2m 53s
test_integrations (rename)	1m 41s
examples (aws-native-java-s3-folder)	2m 41s
examples (azure-java-appservice-sql)	2m 21s
test_integrations (rename-component)	1m 33s
examples (azure-java-static-website)	2m 35s
test_integrations (rename-component-and-child)	1m 51s
examples (gcp-java-gke-hello-world)	2m 36s
test_integrations (retype-component)	1m 46s
test_integrations (retype-parents)	1m 35s
examples (kubernetes)	1m 55s
examples (minimal)	2m 18s
examples (minimalsbt)	2m 19s
examples (random)	2m 7s
	52m 14s

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