Remove unused functions #6478

Job	Run time
nix flake check	2m 57s
Build & test (hydra-plutus)	1m 21s
Build specification using nix	1m 26s
Benchmarks (hydra-node, tx-cost, --output-directory $(pwd)/../benchmarks)	3m 1s
Build & test (hydra-tui)	1m 19s
Benchmarks (hydra-node, micro, -o $(pwd)/../benchmarks/ledger-bench.html)	2m 58s
Build haddock using nix	2m 58s
Benchmarks (hydra-cluster, bench-e2e, datasets datasets/1-node.json datasets/3-nodes.json --outpu...	2m 59s
Compute cost differences	2m 57s
Build & test (hydra-node)	2m 59s
Build & test (hydra-tx)	1m 25s
Build & test (hydra-cluster)	2m 57s
Publish test results	1s
Documentation	1s
Publish benchmark results	1s
	29m 20s

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