BUG: Bad shift_forward around UTC+0 when DST
- [ ] closes #51501 
- [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 an entry in the latest `doc/source/whatsnew/vX.X.X.rst` file if fixing a bug or adding a new feature.

- The algo originates from https://github.com/pandas-dev/pandas/pull/22644. 
- A related bug fix later in https://github.com/pandas-dev/pandas/pull/23406 but failed to take care of edge cases where we move in/out of UTC+0.
  - The 3rd and 4th test case related to utc+0 all fail on main
- More tests added.

Thanks @quangngd 