Remove unused functions #6484

Job	Run time
Build & test (hydra-plutus)	1m 28s
Build & test (hydra-tui)	3m 8s
nix flake check	7m 22s
Build & test (hydra-node)	7m 25s
Benchmarks (hydra-node, tx-cost, --output-directory $(pwd)/../benchmarks)	2m 26s
Build haddock using nix	2m 3s
Build & test (hydra-tx)	2m 30s
Benchmarks (hydra-node, micro, -o $(pwd)/../benchmarks/ledger-bench.html)	1m 42s
Build & test (hydra-cluster)	9m 13s
Benchmarks (hydra-cluster, bench-e2e, datasets datasets/1-node.json datasets/3-nodes.json --outpu...	3m 58s
Build specification using nix	1m 27s
Compute cost differences	3m 49s
Publish benchmark results	3s
Publish test results	1s
Documentation	1s
	46m 36s

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