Ouranosinc / xscen / 20315699314

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Add a conversion of Z (m2 s-2) to orog (m) (#673)

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### Pull Request Checklist:
- [x] This PR addresses an already opened issue (for bug fixes /
features)
    - This PR fixes #xyz
- [x] (If applicable) Documentation has been added / updated (for bug
fixes / features).
- [x] (If applicable) Tests have been added.
- [x] This PR does not seem to break the templates.
- [x] CHANGELOG.rst has been updated (with summary of main changes).
- [x] Link to issue (:issue:`number`) and pull request (:pull:`number`)
has been added.

### What kind of change does this PR introduce?

* Add a conversion from `z` to `orog`, mainly for ERA5-Land.
* Fixed an issue where coordinates were not getting chunked correctly,
which sometimes crashed with Zarr. I've opted to remove chunks from
coordinates, instead of applying the chunks specified in `rechunk`. Any
opinion on this? Should we instead apply the chunks there too?

### Does this PR introduce a breaking change?


### Other information:

14 of 14 new or added lines in 2 files covered. (100.0%)

4253 of 4709 relevant lines covered (90.32%)

3.61 hits per line