removed custom non-related exception

Author: Oleksandr Bazarnov

airbyte_cdk/sources/declarative/parsers/custom_exceptions.py

@@ -19,12 +19,3 @@ class UndefinedReferenceException(Exception):
 
     def __init__(self, path: str, reference: str) -> None:
         super().__init__(f"Undefined reference {reference} from {path}")
-
-
-class ManifestNormalizationException(Exception):
-    """
-    Raised when a circular reference is detected in a manifest.
-    """
-
-    def __init__(self, message: str) -> None:
-        super().__init__(f"Failed to deduplicate manifest: {message}")