Remove unused functions #6477

Job	Run time
Benchmarks (hydra-node, tx-cost, --output-directory $(pwd)/../benchmarks)	5m 10s
Build & test (hydra-plutus)	1m 30s
Build haddock using nix	5m 29s
Benchmarks (hydra-node, micro, -o $(pwd)/../benchmarks/ledger-bench.html)	4m 31s
Build specification using nix	1m 35s
Build & test (hydra-tui)	6m 53s
Benchmarks (hydra-cluster, bench-e2e, datasets datasets/1-node.json datasets/3-nodes.json --outpu...	7m 42s
Build & test (hydra-node)	8m 16s
Build & test (hydra-tx)	1m 46s
nix flake check	8m 24s
Compute cost differences	6m 10s
Build & test (hydra-cluster)	8m 17s
Publish benchmark results	7s
Documentation	1s
Publish test results	1s
	1h 5m 52s

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