Remove some pending tests (#1778) #6766

Job	Run time
Build & test (hydra-plutus)	2m 5s
Build & test (hydra-tui)	3m 56s
Build & test (hydra-node)	7m 53s
Build haddock using nix	1m 44s
Benchmarks (hydra-node, tx-cost, --output-directory $(pwd)/../benchmarks)	2m 48s
Build & test (hydra-tx)	2m 33s
Benchmarks (hydra-node, micro, -o $(pwd)/../benchmarks/ledger-bench.html)	2m 20s
Build & test (hydra-cluster)	12m 8s
nix flake check	5m 31s
Benchmarks (hydra-cluster, bench-e2e, datasets datasets/1-node.json datasets/3-nodes.json --outpu...	4m 42s
Build specification using nix	2m 19s
Compute cost differences	0s
Publish benchmark results	0s
Documentation	4m 11s
Publish test results	14s
	52m 24s

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