[backend] Fix reindex error on deleting old objects (#9270)

[SouadHadjiat]

Proposed changes

• ignore i_valid_* fields that are not part of the mapping
• add test with issue use case

Related issues

• Reindexing fail from opencti_stix_core_relationships-000001 to opencti_deleted_objects #9270

Checklist

• I consider the submitted work as finished
• I tested the code for its functionality
• I wrote test cases for the relevant uses case (coverage and e2e)
• I added/update the relevant documentation (either on github or on notion)
• Where necessary I refactored code to improve the overall quality

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 65.25%. Comparing base (790ad21) to head (d460d48).
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #9742      +/-   ##
==========================================
- Coverage   65.26%   65.25%   -0.01%     
==========================================
  Files         630      630              
  Lines       60314    60317       +3     
  Branches     6774     6771       -3     
==========================================
+ Hits        39361    39362       +1     
- Misses      20953    20955       +2     

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