Display difference in tx-cost outputs as a comment on PRs #5938

Job	Run time
Build & test (plutus-cbor)	1m 58s
Benchmarks (hydra-node, tx-cost, --output-directory $(pwd)/../benchmarks)	3m 4s
Build & test (plutus-merkle-tree)	2m 1s
Build haddock using nix	1m 51s
Benchmarks (hydra-node, micro, -o $(pwd)/../benchmarks/ledger-bench.html)	2m 20s
nix flake check	5m 29s
Build & test (hydra-plutus)	2m 19s
Benchmarks (hydra-cluster, bench-e2e, datasets datasets/1-node.json datasets/3-nodes.json --outpu...	4m 46s
Build & test (hydra-tui)	3m 58s
Benchmarks (plutus-merkle-tree, on-chain-cost, $(pwd)/../benchmarks)	2m 1s
Build & test (hydra-node)	8m 32s
Build & test (hydra-tx)	2m 31s
Build & test (hydra-cluster)	9m 13s
Build specification using nix	2m 15s
Compute cost differences	4m 23s
Publish benchmark results	7s
Publish test results	15s
Documentation	3m 21s
	1h 0m 24s

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