Remove unused functions #6488

Job	Run time
nix flake check	4m 19s
Benchmarks (hydra-node, tx-cost, --output-directory $(pwd)/../benchmarks)	4m 20s
Benchmarks (hydra-node, micro, -o $(pwd)/../benchmarks/ledger-bench.html)	4m 19s
Build specification using nix	1m 27s
Build & test (hydra-plutus)	3m 52s
Benchmarks (hydra-cluster, bench-e2e, datasets datasets/1-node.json datasets/3-nodes.json --outpu...	4m 18s
Build & test (hydra-tui)	4m 6s
Build haddock using nix	4m 19s
Build & test (hydra-node)	3m 29s
Compute cost differences	4m 19s
Build & test (hydra-tx)	4m 20s
Build & test (hydra-cluster)	4m 19s
Publish benchmark results	1s
Documentation	1s
Publish test results	1s
	47m 30s

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