Remove unused functions #6494

Job	Run time
Build haddock using nix	1m 3s
Build & test (hydra-plutus)	1m 21s
Build specification using nix	1m 32s
Build & test (hydra-tui)	3m 8s
Benchmarks (hydra-node, tx-cost, --output-directory $(pwd)/../benchmarks)	2m 28s
nix flake check	4m 59s
Build & test (hydra-node)	4m 56s
Build & test (hydra-tx)	1m 41s
Benchmarks (hydra-node, micro, -o $(pwd)/../benchmarks/ledger-bench.html)	1m 34s
Compute cost differences	3m 55s
Build & test (hydra-cluster)	4m 56s
Benchmarks (hydra-cluster, bench-e2e, datasets datasets/1-node.json datasets/3-nodes.json --outpu...	4m 7s
Publish benchmark results	4s
Documentation	1s
Publish test results	1s
	35m 46s

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