Remove deprecated statistical operators

[schlunma]

Description

This PR removes deprecated statistical operators that have been deprecated in v2.10.0 and are scheduled for removal in v2.12.0. See #2191 for details.

Backwards-incompatible changes

• Operator pXX.YY to specify percentiles for the multi-model statistics preprocessors: please use statistics: [{operator: percentile, percent: XX.YY}] instead; this is an exact replacement. The following example shows how to modify existing recipes:

Old:

  preprocessors:
    mm_stats:
      multi_model_statistics:
        span: overlap
        statistics: [p5, p95]

New:

  preprocessors:
    mm_stats:
      multi_model_statistics:
        span: overlap
        statistics:
          - operator: percentile
            percent: 5
          - operator: percentile
            percent: 95

• Option std: please use std_dev instead; this is an exact replacement. Example:

Old:

  preprocessors:
    test:
      zonal_statistics:
        operator: std

New:

  preprocessors:
    test:
      zonal_statistics:
        operator: std_dev

The old syntax will be deprecated with version 2.10 and removed with version 2.12.

---

Checklist

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 94.91%. Comparing base (892d4a3) to head (625d53c).
Report is 54 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2553      +/-   ##
==========================================
- Coverage   94.92%   94.91%   -0.01%     
==========================================
  Files         251      251              
  Lines       14274    14261      -13     
==========================================
- Hits        13549    13536      -13     
  Misses        725      725              

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[valeriupredoi]

and cheers, again, Manu 🍺