[tests] Update PCE tests

.coverage

.coverage.DESKTOP-ATMEKSV.10624.XjrvRHAx

.coverage.DESKTOP-ATMEKSV.22780.XWOfrNvx

.coverage.DESKTOP-ATMEKSV.25100.XbtpWDFx

.coverage.DESKTOP-ATMEKSV.29056.XrBCQErx

.coverage.DESKTOP-ATMEKSV.34604.XhfDgthx

.coverage.DESKTOP-ATMEKSV.37188.XIOzbGrx

src/bayesvalidrox/bayes_inference/bayes_inference.py

src/bayesvalidrox/surrogate_models/polynomial_chaos.py

src/bayesvalidrox/surrogate_models/surrogate_models.py

tests/test_BayesInference.py

tests/test_MCMC.py

tests/test_MetaModel.py

tests/test_PolynomialChaosEmulator.py

tests/test_SequentialDesign.py

tests/test_supplementary.py