Fix: Implement get_snapshot_file in PytestSnapshotFileLayout

- Add get_snapshot_file implementation that delegates to existing snapshotfile_for_testfile method
- Ensures PytestSnapshotFileLayout properly implements the abstract method

Co-Authored-By: [email protected] <[email protected]>

Author: devin-ai-integration[bot]

python/pytest-selfie/pytest_selfie/plugin.py

@@ -75,6 +75,9 @@ def snapshotfile_for_testfile(self, testfile: TypedPath) -> TypedPath:
         else:
             raise ValueError(f"Unknown file extension, expected .py: {testfile.name}")
 
+    def get_snapshot_file(self, test_file: TypedPath) -> TypedPath:
+        return self.snapshotfile_for_testfile(test_file)
+
     def __infer_default_line_ending_is_unix(self) -> bool:
         def walk_callback(walk: Iterator[TypedPath]) -> bool:
             for file_path in walk: