TST: Add test for Timedelta hash invariance
Adding an xfailing test to reproduce and document #44504.

Ideally the test could cover an even wider set of comparisons, but I think this is a good start.

- [X] [Tests added and passed](https://pandas.pydata.org/pandas-docs/dev/development/contributing_codebase.html#writing-tests) if fixing a bug or adding a new feature
- [X] All [code checks passed](https://pandas.pydata.org/pandas-docs/dev/development/contributing_codebase.html#pre-commit).

Thanks @harahu 