feat(build): Add support for Python scripts via `pythonExtension` (#1… #2061

Job	Run time
typecheck / typecheck	4m 20s
units / 🧪 Unit Tests	3m 1s
publish-webapp / publish	44s
publish-worker / build (coordinator)	1m 33s
publish-worker / build (docker-provider)	51s
publish-worker / build (kubernetes-provider)	40s
	11m 9s

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