Add inherit='all_coords' option to DataTree.to_dataset() (#11230)

* Add inherit='all' option to DataTree.to_dataset()

* Add whats-new entry for inherit='all' (#11230)

* Fix prune() signature accidentally modified by ruff-format

* Fix mypy errors: remove unused type-ignore, add typing.cast in test

* Rename inherit='all' to inherit='all_coords' per review feedback

Author: aladinor

doc/whats-new.rst

@@ -18,6 +18,9 @@ New Features
   guarantees that chunks in xarray match on-disk chunks or multiples of them.
   No chunk splitting allowed. (:pull:`11060`).
   By `Julia Signell <https://github.com/jsignell>`_
+- Added ``inherit='all_coords'`` option to :py:meth:`DataTree.to_dataset` to inherit
+  all parent coordinates, not just indexed ones (:issue:`10812`, :pull:`11230`).
+  By `Alfonso Ladino <https://github.com/aladinor>`_.
 
 Breaking Changes
 ~~~~~~~~~~~~~~~~