Remove samplers from test as done in restructure

Author: NicolaCourtier

tests/integration/test_monte_carlo_thevenin.py

@@ -7,7 +7,6 @@
 import pybop
 from pybop import (
     MALAMCMC,
-    NUTS,
     DramACMC,
     HamiltonianMCMC,
     MonomialGammaHamiltonianMCMC,
@@ -121,19 +120,18 @@ def map_estimate(self, posterior):
     @pytest.mark.parametrize(
         "sampler",
         [
-            NUTS,
             HamiltonianMCMC,
             MonomialGammaHamiltonianMCMC,
             RelativisticMCMC,
-            SliceRankShrinkingMCMC,
             MALAMCMC,
             RaoBlackwellACMC,
             SliceDoublingMCMC,
             SliceStepoutMCMC,
-            DramACMC,
         ],
     )
     def test_sampling_thevenin(self, sampler, posterior, map_estimate):
+        # Note: we don't test the NUTS, SliceRankShrinking or DramACMC samplers,
+        # as convergence for this problem was found to be challenging.
         x0 = np.clip(map_estimate + np.random.normal(0, 5e-3, size=2), 1e-4, 1e-1)
         posterior.parameters.update(initial_values=x0)
         options = pybop.PintsSamplerOptions(