Apply extract exception to keep invalid and absence data

[lpofredc]

fix #139 by adding missing param self._is_extraction_data = True on extraction scripts.

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 2 lines in your changes missing coverage. Please review.

Project coverage is 5.25%. Comparing base (927c9eb) to head (70c28e2).
Report is 20 commits behind head on master.

Files	Patch %	Lines
plugin_qgis_lpo/processing/extract_data.py	0.00%	1 Missing ⚠️
...ugin_qgis_lpo/processing/extract_data_observers.py	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff            @@
##           master    #140      +/-   ##
=========================================
- Coverage    5.25%   5.25%   -0.01%     
=========================================
  Files          22      22              
  Lines        1559    1561       +2     
  Branches      219     219              
=========================================
  Hits           82      82              
- Misses       1473    1475       +2     
  Partials        4       4              

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