Remove unused functions #6493

Job	Run time
Build & test (hydra-plutus)	2m 9s
Benchmarks (hydra-node, tx-cost, --output-directory $(pwd)/../benchmarks)	5m 55s
Build & test (hydra-tui)	7m 3s
Build haddock using nix	6m 34s
Benchmarks (hydra-node, micro, -o $(pwd)/../benchmarks/ledger-bench.html)	5m 16s
Build & test (hydra-node)	8m 16s
Benchmarks (hydra-cluster, bench-e2e, datasets datasets/1-node.json datasets/3-nodes.json --outpu...	7m 42s
Build & test (hydra-tx)	3m 17s
nix flake check	8m 18s
Build & test (hydra-cluster)	8m 17s
Compute cost differences	6m 45s
Build specification using nix	1m 47s
Publish benchmark results	5s
Documentation	1s
Publish test results	1s
	1h 11m 26s

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