Suppress dtype warnings in unit tests (#1539)

Summary:
Pull Request resolved: #1539

The dtype warnings were being raised a few too many times when running unit tests. This adds a filter to ignore them.

Reviewed By: Balandat

Differential Revision: D41757594

fbshipit-source-id: 3af3d1e5265febea7f9767616aeefbc5332520d9

Author: saitcakmak

botorch/utils/testing.py

@@ -45,6 +45,11 @@ def setUp(self):
         warnings.resetwarnings()
         settings.debug._set_state(False)
         warnings.simplefilter("always", append=True)
+        warnings.filterwarnings(
+            "ignore",
+            message="The model inputs are of type",
+            category=UserWarning,
+        )
 
 
 class BaseTestProblemBaseTestCase: