Switch bench-e2e to JSON datasets again #3683

Job	Run time
Build specification using nix	58s
Benchmarks (hydra-node, tx-cost, --output-directory $(pwd)/../benchmarks)	2m 31s
Build haddock using nix	3m 9s
Benchmarks (hydra-node, micro, -o $(pwd)/../benchmarks/ledger-bench.html)	1m 46s
Build & test (plutus-cbor)	1m 14s
Benchmarks (hydra-cluster, bench-e2e, datasets datasets/1-node.json datasets/3-nodes.json --outpu...	5m 27s
Build & test (plutus-merkle-tree)	1m 13s
Benchmarks (plutus-merkle-tree, on-chain-cost, $(pwd)/../benchmarks)	1m 30s
Build & test (hydra-plutus)	1m 20s
Build & test (hydra-tui)	3m 4s
Build & test (hydra-node)	4m 20s
Build & test (hydra-cluster)	8m 41s
Publish benchmark results	4s
Documentation	1m 29s
Publish test results	16s
	37m 2s

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