Remove unused functions #6515

Job	Run time
Build specification using nix	1m 28s
Build haddock using nix	1m 0s
Benchmarks (hydra-node, tx-cost, --output-directory $(pwd)/../benchmarks)	2m 32s
Build & test (hydra-plutus)	1m 20s
Benchmarks (hydra-node, micro, -o $(pwd)/../benchmarks/ledger-bench.html)	1m 44s
Build & test (hydra-tui)	3m 12s
nix flake check	4m 27s
Benchmarks (hydra-cluster, bench-e2e, datasets datasets/1-node.json datasets/3-nodes.json --outpu...	4m 2s
Compute cost differences	3m 45s
Build & test (hydra-node)	8m 41s
Build & test (hydra-tx)	2m 2s
Build & test (hydra-cluster)	10m 7s
Publish benchmark results	17s
Publish test results	15s
Documentation	2m 39s
	47m 31s

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