REG: quantile with IntegerArray/FloatingArray
- [x] closes #39771
- [x] tests added / passed
- [ ] Ensure all linting tests pass, see [here](https://pandas.pydata.org/pandas-docs/dev/development/contributing.html#code-standards) for how to run them
- [ ] whatsnew entry

Not present in any released version, so no release note needed as long as before 1.3