BUG: change lxml remove to drop_tree (#51629)
According to [this SO question](https://stackoverflow.com/questions/42932828/how-delete-tag-from-node-in-lxml-without-tail) `remove` method removes tail text. In order to preserve it the method was changed to `drop_tree`. Appropriate test was added.

- [x] closes #51629
- [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).
- [ ] 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.

Looks okay. Could you add a whatsnew note in `v2.1.0.rst`? > Looks okay. Could you add a whatsnew note in `v2.1.0.rst`?

Done Thanks @m-ganko 