TST: Replace ensure_clean with pytest temp_file/tmp_path fixture.

[invain01]

Summary of Changes: Replace ensure_clean with pytest temp_file/tmp_path

This PR refactors three test files to replace usage of the legacy tm.ensure_clean context manager with pytest's modern temporary file fixtures (tmp_path or temp_file). This change aligns with pandas testing best practices and improves test reliability and readability.

Modified Files

• pandas/tests/io/parser/test_c_parser_only.py
• pandas/tests/io/parser/dtypes/test_dtypes_basic.py
• pandas/tests/io/parser/common/test_read_errors.py

Key Changes

• All usages of tm.ensure_clean were replaced with either tmp_path (for custom filenames) or temp_file (for generic temp files).
• Corresponding test functions were updated to accept the required pytest fixture as an argument.

[mroeschke]

Thanks @invain01