Remove cardano-configurations submodule #5954

Job	Run time
Build haddock using nix	1m 45s
Build & test (plutus-cbor)	1m 49s
Benchmarks (hydra-node, tx-cost, --output-directory $(pwd)/../benchmarks)	3m 6s
Build & test (plutus-merkle-tree)	1m 49s
Benchmarks (hydra-node, micro, -o $(pwd)/../benchmarks/ledger-bench.html)	2m 15s
Build & test (hydra-plutus)	2m 9s
Benchmarks (hydra-cluster, bench-e2e, datasets datasets/1-node.json datasets/3-nodes.json --outpu...	4m 45s
Build & test (hydra-tui)	3m 54s
Benchmarks (plutus-merkle-tree, on-chain-cost, $(pwd)/../benchmarks)	5m 14s
Build & test (hydra-node)	5m 5s
Build & test (hydra-tx)	2m 25s
Build specification using nix	2m 14s
Build & test (hydra-cluster)	5m 35s
nix flake check	3m 29s
Compute cost differences	1m 39s
Publish benchmark results	3s
Publish test results	1s
Documentation	1s
	47m 18s

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