Ouranosinc / xclim / 18138474013

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Control invalidity in robustness fractions (#2245)

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### Pull Request Checklist:
- [ ] This PR addresses an already opened issue (for bug fixes /
features)
    - This PR fixes #xyz
- [x] Tests for the changes have been added (for bug fixes / features)
- [x] (If applicable) Documentation has been added / updated (for bug
fixes / features)
- [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 `invalid` argument to `robustness_fractions`. This argument
receives instances from `xclim.core.missing` classes (`MissingAny`,
`AtLeastNValid`, etc). It is used to flag points as invalid and remove
them from the fraction calculation.

### Does this PR introduce a breaking change?
Default is `MissingAny` which has the same behaviour as the previous
code.


### Other information:

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7844 of 8515 relevant lines covered (92.12%)

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