Chore: Make linter happy (#1256)

* refactor: remove unused imports

* fix: replace NotImplemented with NotImplementedError

* refactor: resolve E722 (do not use bare 'except')

* refactor: remove unused variable

* refactor: remove unused imports

* refactor: ignore unused imports that will be used in the future

* refactor: resolve W293 (blank line contains whitespace)

* refactor: resolve F541 (f-string is missing placeholders)

---------

Co-authored-by: afourney <adamfo@microsoft.com>

packages/markitdown/tests/test_module_vectors.py

@@ -2,7 +2,6 @@
 import os
 import time
 import pytest
-import codecs
 import base64
 
 from pathlib import Path
@@ -14,8 +13,6 @@ else:
 
 from markitdown import (
     MarkItDown,
-    UnsupportedFormatException,
-    FileConversionException,
     StreamInfo,
 )
 
@@ -203,8 +200,6 @@ def test_convert_stream_keep_data_uris(test_vector):
 
 
 if __name__ == "__main__":
-    import sys
-
     """Runs this file's tests from the command line."""
 
     # General tests