BUG: DataFrame.drop fails when columns argument given tuple
- [x] closes #43978 
- [x] tests added / passed
- [x] Ensure all linting tests pass, see [here](https://pandas.pydata.org/pandas-docs/dev/development/contributing_codebase.html#pre-commit) for how to run them
- [ ] whatsnew entry

I dont like allowing tuples as sequence input. See: https://github.com/pandas-dev/pandas/pull/42329#issuecomment-872249189 Closed this for now since it is not clear how to proceed and there is ambiguity around using tuples for indexing. 