[backend/frontend] Add "From/To" attributes ref in sightings relationships(#5814)

[CelineSebe]

Proposed changes

• [backend] add a method isStixSightingRelationship
• [frontend] all entities are able to be in a sighting relationship (permisssive option)

Related issues

• "Sightings" attributes in csv mapper relationships are missing #5814

Checklist

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

Further comments

If this is a relatively large or complex change, kick off the discussion by explaining why you chose the solution you did and what alternatives you considered, etc...

[codecov]

Codecov Report

Attention: 3 lines in your changes are missing coverage. Please review.

Comparison is base (49ecb64) 65.44% compared to head (6ad3284) 65.44%.

Files	Patch %	Lines
...src/modules/internal/csvMapper/csvMapper-domain.ts	25.00%	3 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #5821   +/-   ##
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  Coverage   65.44%   65.44%           
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  Files         539      539           
  Lines       63051    63055    +4     
  Branches     5052     5053    +1     
=======================================
+ Hits        41264    41269    +5     
+ Misses      21787    21786    -1     

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[lndrtrbn]

So sighting relationships can link every entities between them?

[CelineSebe]

So sighting relationships can link every entities between them?

For now, here and elsewhere on the plateform, can link every entities between them. The notion of sighting is expanded compared to the stix standards

[lndrtrbn]

When I try to add a relationship in the CSV mapper I have no attribute listed