Keep ServerOutput type at the api boundary #7156

Job	Run time
Build haddock using nix	1m 17s
Build specification using nix	1m 37s
Benchmarks (hydra-node, tx-cost, --output-directory $(pwd)/../benchmarks)	2m 14s
Benchmarks (hydra-node, micro, -o $(pwd)/../benchmarks/ledger-bench.html)	1m 33s
Build & test (hydra-plutus)	1m 21s
nix flake check	8m 9s
Benchmarks (hydra-cluster, bench-e2e, datasets datasets/1-node.json datasets/3-nodes.json --outpu...	4m 3s
Compute cost differences	3m 29s
Build & test (hydra-tx)	2m 15s
Build & test (hydra-chain-observer)	1m 34s
Build & test (hydra-node)	8m 3s
Build & test (hydra-tui)	3m 14s
Build & test (hydra-cluster)	8m 4s
Publish benchmark results	4s
Documentation	1s
	46m 58s

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