dev CLI: cleanup deprecated background worker files (fixes #1572) (#1… #1960

Job	Run time
typecheck / typecheck	2m 41s
units / 🧪 Unit Tests	1m 50s
publish-webapp / publish	42s
publish-worker / build (coordinator)	1m 21s
publish-worker / build (docker-provider)	47s
publish-worker / build (kubernetes-provider)	42s
	8m 3s

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