Remove unused functions #6486

Job	Run time
Build & test (hydra-plutus)	1m 20s
Benchmarks (hydra-node, tx-cost, --output-directory $(pwd)/../benchmarks)	5m 20s
Build specification using nix	1m 26s
Build & test (hydra-tui)	5m 8s
Benchmarks (hydra-node, micro, -o $(pwd)/../benchmarks/ledger-bench.html)	5m 16s
Build & test (hydra-node)	5m 24s
Benchmarks (hydra-cluster, bench-e2e, datasets datasets/1-node.json datasets/3-nodes.json --outpu...	5m 25s
Build & test (hydra-tx)	3m 17s
Build haddock using nix	3m 55s
Build & test (hydra-cluster)	5m 22s
nix flake check	3m 46s
Compute cost differences	3m 45s
Publish benchmark results	1s
Publish test results	1s
Documentation	1s
	49m 27s

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