Run Haskell tests individually

This is because cabal test all is currently failing sometimes as
individual test suites are not isolated from each other (test polution).

.github/workflows/ci-nix.yaml

@@ -58,7 +58,14 @@ jobs:
       env:
         TERM: "xterm"
       run: |
-        cabal test all
+        # NOTE: Individual invocation because of test polution
+        cabal test hydra-plutus
+        cabal test hydra-tx
+        cabal test hydra-node
+        cabal test hydra-cluster
+        cabal test hydra-chain-observer
+        cabal test hydra-tui
+        cabal test hydra-explorer
 
     - name: 💾 Upload test results
       uses: actions/upload-artifact@v4
@@ -77,11 +84,6 @@ jobs:
     - name: 📈 Benchmark
       run: |
         mkdir -p benchmarks
-
-        cd ${{ matrix.package }}
-        nix build .#${{ matrix.package }}-bench
-        nix develop .#${{ matrix.package }}-bench --command ${{ matrix.bench }} ${{ matrix.options }}
-
         cabal bench on-chain-cost --benchmark-options "./benchmarks"
         cabal bench tx-cost --benchmark-options "--output-directory ./benchmarks"
         cabal bench micro --benchmark-options "-o ./benchmarks/ledger-bench.html"