TST: check visibility of x label and xtick labels for plot.hexbin
- [x] closes #44050

added a test for checking visibility of xlabel and xtick labels
This pull request is stale because it has been open for thirty days with no activity. Please [update](https://pandas.pydata.org/pandas-docs/stable/development/contributing.html#updating-your-pull-request) and respond to this comment if you're still interested in working on this. Thanks for the PR but it looks to have gone stale. Going to close to clear the PR queue but feel free to ping if you want to continue