Small changes to run benchmarks for lots of transactions #6186

Job	Run time
Build specification using nix	1m 47s
Benchmarks (hydra-node, tx-cost, --output-directory $(pwd)/../benchmarks)	5m 49s
Build & test (hydra-plutus)	1m 45s
Build haddock using nix	5m 31s
Benchmarks (hydra-node, micro, -o $(pwd)/../benchmarks/ledger-bench.html)	4m 41s
Build & test (hydra-tui)	7m 0s
Benchmarks (hydra-cluster, bench-e2e, datasets datasets/1-node.json datasets/3-nodes.json --outpu...	7m 39s
Build & test (hydra-node)	11m 43s
nix flake check	9m 51s
Compute cost differences	5m 59s
Build & test (hydra-tx)	1m 38s
Build & test (hydra-cluster)	13m 33s
Publish benchmark results	3s
Documentation	2m 53s
Publish test results	19s
	1h 20m 11s

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