The pandas test suite uses an ensure_clean utility function to create a temporary file for testing

This utility should be largely redundant with the temp_file pytest fixture

Since there are about ~180 occurrences of ensure_clean in the code base, this issue should be completed in multiple PRs that replaces ensure_clean with temp_file in a particular file. Therefore, this issue can be worked on by multiple contributors.

For those interested in working on this issue:

1. Comment below on which file in pandas/tests you'll be working on.
2. Submit a PR that replace ensure_clean with temp_file which still passes the tests.

When submitting a PR for a fix:

• If a test doesn't appear to explicitly need to test a str file argument, please change the test to use temp_file directly (i.e. avoid doing str(temp_file) if not needed)
• If a test requires a specific file name or extension (e.g. .xls), please construct an argument using the pytest tmp_path fixture instead (e.g. path = tmp_path / "tmp.xls")

Once all the uses of ensure_clean are replaced, a separate PR to remove ensure_clean would be welcome.