ENH: Change DataFrame.to_excel to output unformatted excel file
- [X] closes #54154
- [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).
- [x] Added [type annotations](https://pandas.pydata.org/pandas-docs/dev/development/contributing_codebase.html#type-hints) to new arguments/methods/functions.
- [X] Added an entry in the latest `doc/source/whatsnew/vX.X.X.rst` file if fixing a bug or adding a new feature.

@rhshadrach pinging on green 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. > 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.

Still interested in working on this PR. Waiting for whatsnew v3.0 to come out @rmhowe425 the `3.0.0.rst` whatsnew is out now. Are you still interested in continuing this? > @rmhowe425 the `3.0.0.rst` whatsnew is out now. Are you still interested in continuing this?

Yes I am still interested! Thank you for pinging me and letting me know! @rhshadrach @mroeschke Pinging on green. 

Did you guys want me to combine my unit tests into one test as recommended [here](https://github.com/pandas-dev/pandas/pull/54302#discussion_r1479936625)?

IMHO I think it makes more sense to keep them separated, but happy to combine them if you guys want me to. @mroeschke Pinging on green Thanks @rmhowe425 