DEPR: deprecate element-wise operations in (Series|DataFrame).transform
- [x] closes #54906 
- [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.
- [ ] Added an entry in the latest `doc/source/whatsnew/vX.X.X.rst` file if fixing a bug or adding a new feature.

Still need to do docs, docstrings and whatsnew and possibly some separate deprecation tests but otherwise should be ready for review. 
> Still need to do docs, docstrings and whatsnew and possibly some separate deprecation tests but otherwise should be ready for review.

I think the implications of this PR can only be understood with appropriate changes to the docs. The failure looks unrelated. 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 pull request, but it appears to have gone stale. Let's continue the affirm the choice to move forward with this in the issue before moving forward here