Fix bench-e2e single mode and keep results #5906

Job	Run time
Build haddock using nix	3m 33s
Build & test (plutus-cbor)	1m 45s
Benchmarks (hydra-node, tx-cost, --output-directory $(pwd)/../benchmarks)	2m 56s
Build & test (plutus-merkle-tree)	1m 57s
Benchmarks (hydra-node, micro, -o $(pwd)/../benchmarks/ledger-bench.html)	2m 26s
Build specification using nix	2m 21s
Build & test (hydra-plutus)	2m 8s
Benchmarks (hydra-cluster, bench-e2e, datasets datasets/1-node.json datasets/3-nodes.json --outpu...	4m 43s
Build & test (hydra-tui)	4m 38s
nix flake check	10m 16s
Benchmarks (plutus-merkle-tree, on-chain-cost, $(pwd)/../benchmarks)	1m 54s
Build & test (hydra-node)	7m 53s
Build & test (hydra-tx)	2m 35s
Build & test (hydra-cluster)	10m 18s
Publish benchmark results	7s
Publish test results	13s
Documentation	3m 31s
	1h 3m 14s

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