Remove unused functions #6489

Job	Run time
Benchmarks (hydra-node, tx-cost, --output-directory $(pwd)/../benchmarks)	1m 11s
Benchmarks (hydra-node, micro, -o $(pwd)/../benchmarks/ledger-bench.html)	1m 10s
Build & test (hydra-plutus)	1m 8s
Build specification using nix	1m 10s
Benchmarks (hydra-cluster, bench-e2e, datasets datasets/1-node.json datasets/3-nodes.json --outpu...	1m 9s
Build & test (hydra-tui)	58s
Build & test (hydra-node)	1m 9s
Build & test (hydra-tx)	28s
nix flake check	1m 9s
Build & test (hydra-cluster)	1m 8s
Build haddock using nix	1s
Compute cost differences	1s
Publish test results	1s
Documentation	1s
Publish benchmark results	1s
	10m 45s

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