Hydra clean updates #6121

Job	Run time
Build specification using nix	1m 32s
Build & test (hydra-plutus)	1m 37s
Benchmarks (hydra-node, tx-cost, --output-directory $(pwd)/../benchmarks)	2m 59s
Build & test (hydra-tui)	3m 15s
Benchmarks (hydra-node, micro, -o $(pwd)/../benchmarks/ledger-bench.html)	3m 45s
Build & test (hydra-node)	7m 23s
Build haddock using nix	1m 2s
Benchmarks (hydra-cluster, bench-e2e, datasets datasets/1-node.json datasets/3-nodes.json --outpu...	5m 23s
Build & test (hydra-tx)	1m 55s
Build & test (hydra-cluster)	8m 42s
nix flake check	5m 6s
Compute cost differences	3m 41s
Publish benchmark results	0s
Publish test results	10s
Documentation	2m 48s
	49m 18s

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