Disable legacy scaffolder plugin for now #4710

Job	Run time
build	1m 19s
lint	9s
publish_gh_pages	3s
publish_s3 (default/system/developer-portal)	2s
publish_s3 (default/component/developer-portal-backend)	4s
publish_s3 (default/component/developer-portal-frontend)	2s
	1m 39s

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