refactor: make beam work without `AppOrProxyId` #2904

Job	Run time
build-with-samply / Build (amd64)	2m 48s
build-with-samply / Security, License Check	29s
build-with-samply / Build (amd64, sockets)	2m 53s
build-with-samply / Cargo fmt check	-1s
build-with-samply / Test	1m 2s
build-with-samply / Test (sockets)	1m 19s
build-with-samply / Docker (beam-broker) / Tidy GHCR images (samply/beam-broker)	30s
build-with-samply / Docker (beam-broker, sockets) / Dockerize (beam-broker) (-sockets)	1m 3s
build-with-samply / Docker (beam-broker) / Dockerize (beam-broker)	1m 4s
build-with-samply / Docker (beam-broker, sockets) / Tidy GHCR images (samply/beam-broker)	27s
build-with-samply / Docker (beam-proxy) / Dockerize (beam-proxy)	1m 1s
build-with-samply / Docker (beam-proxy, sockets) / Tidy GHCR images (samply/beam-proxy)	25s
build-with-samply / Docker (beam-proxy) / Tidy GHCR images (samply/beam-proxy)	26s
build-with-samply / Docker (beam-proxy, sockets) / Dockerize (beam-proxy) (-sockets)	1m 11s
	14m 37s

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