[client] ignore inferred items during import (#14566)

[JeremyCloarec]

Proposed changes

• ignore inferred items during import

Related issues

• fix Playbook: duplicate inferred relationship #14566

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

Further comments

[codecov]

Codecov Report

❌ Patch coverage is 75.00000% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 32.36%. Comparing base (0114378) to head (21a89ae).

Files with missing lines	Patch %	Lines
client-python/pycti/utils/opencti_stix2.py	75.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master   #14577      +/-   ##
==========================================
- Coverage   32.36%   32.36%   -0.01%     
==========================================
  Files        3096     3096              
  Lines      210893   210896       +3     
  Branches    38195    38194       -1     
==========================================
- Hits        68257    68256       -1     
- Misses     142636   142640       +4     

Flag	Coverage Δ
opencti-client-python	45.50% <75.00%> (+<0.01%)	⬆️
opencti-front	2.83% <ø> (ø)
opencti-graphql	67.73% <ø> (-0.01%)	⬇️

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[marieflorescontact]

locally tested ok 👌