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_cli_misc.py

@@ -1,6 +1,5 @@
 #!/usr/bin/env python3 -m pytest
 import subprocess
-import pytest
 from markitdown import __version__
 
 # This file contains CLI tests that are not directly tested by the FileTestVectors.
@@ -24,8 +23,8 @@ def test_invalid_flag() -> None:
     assert result.returncode != 0, f"CLI exited with error: {result.stderr}"
     assert (
         "unrecognized arguments" in result.stderr
-    ), f"Expected 'unrecognized arguments' to appear in STDERR"
-    assert "SYNTAX" in result.stderr, f"Expected 'SYNTAX' to appear in STDERR"
+    ), "Expected 'unrecognized arguments' to appear in STDERR"
+    assert "SYNTAX" in result.stderr, "Expected 'SYNTAX' to appear in STDERR"
 
 
 if __name__ == "__main__":