BUG: Index.getitem returning wrong result with negative step for arrow
- [ ] closes #xxxx (Replace xxxx with the GitHub issue number)
- [ ] [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
- [ ] 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.
- [ ] Added an entry in the latest `doc/source/whatsnew/vX.X.X.rst` file if fixing a bug or adding a new feature.


```
idx = Index(list("bcdxy"), dtype="string[pyarrow_numpy]")
idx[slice(4, -6, -1)]
```

This omits b for arrow dtypes and looks like a bug on the arrow side, cc @jorisvandenbossche 
Opened an issue on the Arrow side -> https://github.com/apache/arrow/issues/38768 Thanks @phofl  Owee, I'm MrMeeseeks, Look at me.

There seem to be a conflict, please backport manually. Here are approximate instructions:

1. Checkout backport branch and update it.

```
git checkout 2.1.x
git pull
```

2. Cherry pick the first parent branch of the this PR on top of the older branch:
```
git cherry-pick -x -m1 196e907a4d88f6cd11062f3fb02b3c76faf51b6b
```

3. You will likely have some merge/cherry-pick conflict here, fix them and commit:

```
git commit -am 'Backport PR #55832: BUG: Index.getitem returning wrong result with negative step for arrow'
```

4. Push to a named branch:

```
git push YOURFORK 2.1.x:auto-backport-of-pr-55832-on-2.1.x
```

5. Create a PR against branch 2.1.x, I would have named this PR:

> "Backport PR #55832 on branch 2.1.x (BUG: Index.getitem returning wrong result with negative step for arrow)"

And apply the correct labels and milestones.

Congratulations — you did some good work! Hopefully your backport PR will be tested by the continuous integration and merged soon!

Remember to remove the `Still Needs Manual Backport` label once the PR gets merged.

If these instructions are inaccurate, feel free to [suggest an improvement](https://github.com/MeeseeksBox/MeeseeksDev).
                