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Fix tests relying on inexact pint 0.24 and avoid numbagg-introduced noise in standardized index testing (#2228)

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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?

* Fix tests that were relying on inexact conversions from pint 0.24.4
+ `pr` data flags where strangely inputting an array full of 1 mm/d and
then asserting that the "eq_1_repeating_for_10_or_more_days" tests was
_false_. Fixed to True, skipped with older pint.
+ Similarly, the other test had hardcoded inexact kg m-2 s-1 values that
converted to 1 in pint 0.24.4, but not pint 0.25.
+ The dry spell tests had a day where the precip amount was just under 3
mm because of inexact conversion, but in theory it should have been 3
(which it is in new pint). The threshold was modified to be less
sensitive.
* Avoid `numbagg` for standardized indices. It seems the use (or not) of
numbagg changes only slightly the rolling mean values, but this change
is enough to throw off the mle-fit-based result of the test. I create a
simple fixture that simply deactivates the usage of `numbagg` in the
tests where it is added as an arg.

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


### Other information:

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