Revert smoke-test.yaml file to use install-nix-action directly (#1811) #6929

Job	Run time
Build & test (hydra-plutus)	1m 18s
Build & test (hydra-tui)	3m 4s
Build & test (hydra-node)	7m 35s
Build & test (hydra-tx)	1m 53s
Build & test (hydra-cluster)	11m 34s
Benchmarks (hydra-node, tx-cost, --output-directory $(pwd)/../benchmarks)	2m 5s
Benchmarks (hydra-node, micro, -o $(pwd)/../benchmarks/ledger-bench.html)	1m 29s
Benchmarks (hydra-cluster, bench-e2e, datasets datasets/1-node.json datasets/3-nodes.json --outpu...	3m 51s
Build haddock using nix	1m 8s
Build specification using nix	1m 27s
nix flake check	4m 22s
Compute cost differences	0s
Publish benchmark results	0s
Publish test results	13s
Documentation	2m 58s
	42m 57s

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