Remove unused functions #6501

Job	Run time
Build haddock using nix	1m 3s
Benchmarks (hydra-node, tx-cost, --output-directory $(pwd)/../benchmarks)	2m 20s
Build & test (hydra-plutus)	1m 19s
Benchmarks (hydra-node, micro, -o $(pwd)/../benchmarks/ledger-bench.html)	1m 34s
Build & test (hydra-tui)	3m 7s
Build & test (hydra-node)	9m 10s
Benchmarks (hydra-cluster, bench-e2e, datasets datasets/1-node.json datasets/3-nodes.json --outpu...	3m 54s
Build & test (hydra-tx)	1m 48s
Build specification using nix	1m 37s
Build & test (hydra-cluster)	9m 45s
nix flake check	6m 5s
Compute cost differences	3m 47s
Publish benchmark results	3s
Publish test results	26s
Documentation	3m 8s
	49m 6s

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