Remove unused functions #6492

Job	Run time
Build haddock using nix	3m 56s
Benchmarks (hydra-node, tx-cost, --output-directory $(pwd)/../benchmarks)	3m 55s
Benchmarks (hydra-node, micro, -o $(pwd)/../benchmarks/ledger-bench.html)	3m 55s
Build & test (hydra-plutus)	3m 55s
Build & test (hydra-tui)	3m 43s
Benchmarks (hydra-cluster, bench-e2e, datasets datasets/1-node.json datasets/3-nodes.json --outpu...	4m 0s
Build specification using nix	1m 36s
Build & test (hydra-node)	3m 56s
nix flake check	3m 59s
Build & test (hydra-tx)	3m 55s
Compute cost differences	3m 55s
Build & test (hydra-cluster)	3m 55s
Publish test results	1s
Documentation	1s
Publish benchmark results	1s
	44m 43s

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