Remove unused functions #6481

Job	Run time
Benchmarks (hydra-node, tx-cost, --output-directory $(pwd)/../benchmarks)	3m 21s
Build & test (hydra-plutus)	1m 21s
Build specification using nix	1m 28s
Benchmarks (hydra-node, micro, -o $(pwd)/../benchmarks/ledger-bench.html)	2m 20s
Build & test (hydra-tui)	4m 8s
Benchmarks (hydra-cluster, bench-e2e, datasets datasets/1-node.json datasets/3-nodes.json --outpu...	4m 2s
Build & test (hydra-node)	9m 0s
Build haddock using nix	3m 43s
Build & test (hydra-tx)	1m 58s
nix flake check	8m 47s
Build & test (hydra-cluster)	11m 28s
Compute cost differences	3m 49s
Publish benchmark results	4s
Publish test results	19s
Documentation	2m 33s
	58m 21s

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