Fix workbench. Do Databricks credential loading during init instead of during import

Author: dbkegley

src/posit/connect/external/databricks.py

@@ -87,8 +87,8 @@ def __call__(self) -> Dict[str, str]:
 class WorkbenchStrategy(CredentialsStrategy):
     """
     """
-    def __init__(self, config: Config = Config(profile="workbench")):
-        self._config = config
+    def __init__(self, config: Config):
+        self._config = config or Config("workbench")
 
     def auth_type(self) -> str:
         return POSIT_WORKBENCH_AUTH_TYPE