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Realization not required to be a dim on `subset_warming_level` (#633)

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### Pull Request Checklist:
- [ ] This PR addresses an already opened issue (for bug fixes /
features)
    - This PR fixes #xyz
- [ ] (If applicable) Documentation has been added / updated (for bug
fixes / features).
- [ ] (If applicable) Tests have been added.
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has been added.

### What kind of change does this PR introduce?
In `subset_warming_level`, if we want to vectorize on realizations, it
was previously needed that `ds.realization` be a dimension of the
dataset. This is common, but makes it impossible to have multiple
identical "realizations" in the dataset. This case happens when dealing
with RCMs (multiple runs from the same GCM).

This PR solves the issue with a minimal change : `ds.realization` can be
an auxiliary coord.

### Does this PR introduce a breaking change?
No.

6 of 6 new or added lines in 1 file covered. (100.0%)

4068 of 4618 relevant lines covered (88.09%)

6.07 hits per line