refactor: make beam work without `AppOrProxyId` #2906

Job	Run time
build-with-samply / Build (amd64)	1m 54s
build-with-samply / Security, License Check	21s
build-with-samply / Build (amd64, sockets)	1m 41s
build-with-samply / Cargo fmt check	0s
build-with-samply / Test (sockets)	1m 2s
build-with-samply / Test	58s
build-with-samply / Docker (beam-broker) / Dockerize (beam-broker)	47s
build-with-samply / Docker (beam-proxy, sockets) / Dockerize (beam-proxy) (-sockets)	48s
build-with-samply / Docker (beam-broker, sockets) / Tidy GHCR images (samply/beam-broker)	25s
build-with-samply / Docker (beam-proxy) / Tidy GHCR images (samply/beam-proxy)	24s
build-with-samply / Docker (beam-broker, sockets) / Dockerize (beam-broker) (-sockets)	1m 15s
build-with-samply / Docker (beam-broker) / Tidy GHCR images (samply/beam-broker)	33s
build-with-samply / Docker (beam-proxy) / Dockerize (beam-proxy)	54s
build-with-samply / Docker (beam-proxy, sockets) / Tidy GHCR images (samply/beam-proxy)	25s
	11m 27s

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