Consistent Timedelta Writing for all Excel Engines
- [X] closes #19900
- [X] tests added / passed
- [X] passes `git diff upstream/master -u -- "*.py" | flake8 --diff`
- [X] whatsnew entry

I've basically copied the implementation that was done for the `XlwtWriter` class in #19244 over to the other engine subclasses for an easy fix. This might also fix #19911