Remove unused functions #6490

Job	Run time
Build & test (hydra-plutus)	1m 21s
Build haddock using nix	6m 3s
Build & test (hydra-tui)	6m 43s
Build & test (hydra-node)	10m 55s
Build & test (hydra-tx)	2m 27s
Benchmarks (hydra-node, tx-cost, --output-directory $(pwd)/../benchmarks)	5m 6s
Build & test (hydra-cluster)	13m 43s
Benchmarks (hydra-node, micro, -o $(pwd)/../benchmarks/ledger-bench.html)	4m 41s
Benchmarks (hydra-cluster, bench-e2e, datasets datasets/1-node.json datasets/3-nodes.json --outpu...	7m 34s
Build specification using nix	1m 35s
nix flake check	11m 58s
Compute cost differences	4m 28s
Publish benchmark results	8s
Documentation	1m 36s
Publish test results	18s
	1h 18m 36s

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