13911 | Add ignoring of RuntimeWarning of aer in GenericBackendV2 test (Qiskit#13912)

* 13911 | Add ignoring of RuntimeWarning for GenericBackendV2 in test

* 13911 | Move warning filtering to correct class

Author: LeanderCS

test/utils/base.py

@@ -94,6 +94,13 @@ def setUpClass(cls):
         warnings.filterwarnings("error", category=DeprecationWarning)
         warnings.filterwarnings("error", category=QiskitWarning)
 
+        warnings.filterwarnings(
+            "ignore",
+            category=RuntimeWarning,
+            message="Aer not found using BasicSimulator and no noise",
+            module="qiskit.providers.fake_provider.generic_backend_v2",
+        )
+
         # Numpy 2 made a few new modules private, and have warnings that trigger if you try to
         # access attributes that _would_ have existed.  Unfortunately, Python's `warnings` module
         # adds a field called `__warningregistry__` to any module that triggers a warning, and