Remove redundant S3Metadata.__eq__

collections.abc.Mapping already provides __eq__ that compares against
any Mapping (dict is a registered subclass), which covers both
S3Metadata-to-S3Metadata and S3Metadata-to-dict comparison over the
user-defined metadata.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

Author: laughingman7743

pyathena/filesystem/s3_object.py

@@ -236,13 +236,6 @@ def __iter__(self) -> Iterator[str]:
     def __len__(self) -> int:
         return len(self._user_metadata)
 
-    def __eq__(self, other: object) -> bool:
-        if isinstance(other, S3Metadata):
-            return self._user_metadata == other._user_metadata
-        if isinstance(other, Mapping):
-            return self._user_metadata == dict(other)
-        return NotImplemented
-
     def __repr__(self) -> str:
         return f"{self.__class__.__name__}({self._user_metadata!r})"