Fix: Metadata extraction of erronous values and Agent extraction

[syphax-bouazzouni]

fix agroportal/project-management#582, this enables again the extraction of Agents and re-enforces the extraction process to not fail if only some of the extracted attributes are not valid, accepting the valid and revoking the invalid.

Changes

• Update metadata extractor to validate each extracted metadata separately to not crash all the process if only some fields are incorrect (f0ddab8)
• Update submission extraction test to catch erroneous extracted value (b99d26f)
• Update the metadata extractor to extract agents (2602532)
• Add agent extraction unit tests (b956c9c)

[codecov]

Codecov Report

Attention: Patch coverage is 88.88889% with 4 lines in your changes missing coverage. Please review.

Project coverage is 81.97%. Comparing base (552fbe5) to head (b956c9c).
Report is 1 commits behind head on development.

Files	Patch %	Lines
..._process/operations/submission_extract_metadata.rb	88.57%	4 Missing ⚠️

Additional details and impacted files

@@               Coverage Diff               @@
##           development     #154      +/-   ##
===============================================
+ Coverage        81.83%   81.97%   +0.14%     
===============================================
  Files              100      100              
  Lines             6616     6635      +19     
===============================================
+ Hits              5414     5439      +25     
+ Misses            1202     1196       -6     

Flag	Coverage Δ
unittests	81.97% <88.88%> (+0.14%)	⬆️

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