TST: Add test for visibility of x label and xtick labels for `plot.hexbin`
- [x] closes #44050 (Replace xxxx with the GitHub issue number)
- [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).

This PR adds a unit test to `pandas/tests/plotting/frame/test_frame.py` to verify that hexbin plots correctly display x labels and xtick labels. Adds a test for the solved issue described in GH https://github.com/pandas-dev/pandas/issues/44050.


Thanks @jasonmokk 