Remove unused functions #6491

Job	Run time
Build haddock using nix	8m 59s
nix flake check	9m 1s
Build specification using nix	1m 33s
Benchmarks (hydra-node, tx-cost, --output-directory $(pwd)/../benchmarks)	7m 55s
Build & test (hydra-plutus)	3m 53s
Compute cost differences	8m 59s
Build & test (hydra-tui)	7m 30s
Benchmarks (hydra-node, micro, -o $(pwd)/../benchmarks/ledger-bench.html)	7m 34s
Build & test (hydra-node)	8m 58s
Build & test (hydra-tx)	5m 18s
Benchmarks (hydra-cluster, bench-e2e, datasets datasets/1-node.json datasets/3-nodes.json --outpu...	8m 59s
Build & test (hydra-cluster)	9m 0s
Publish test results	1s
Publish benchmark results	1s
Documentation	1s
	1h 27m 42s

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