[backend] Fix observables query for network traffic with dst_port (#6070)

[SouadHadjiat]

Proposed changes

• dst_port is an integer, we should not try to query it with ".keyword", it's also the case of other fields like "number", so we have to rewrite completely the script to handle all types of fields.
• Add an integration test create a network traffic with dst_port and to list observables ordered by "observable_value"

Related issues

• Having Network Traffic observable with a dst ref makes the observable listing crash #6070

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

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 40 lines in your changes are missing coverage. Please review.

Project coverage is 66.72%. Comparing base (854fd39) to head (94ca0bb).
Report is 3 commits behind head on master.

Files	Patch %	Lines
...encti-platform/opencti-graphql/src/utils/format.js	0.00%	40 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #6073      +/-   ##
==========================================
+ Coverage   66.57%   66.72%   +0.15%     
==========================================
  Files         540      540              
  Lines       64270    64184      -86     
  Branches     5223     5242      +19     
==========================================
+ Hits        42788    42828      +40     
+ Misses      21482    21356     -126     

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[SouadHadjiat]

we need to return a String value because the type of the runtime field is "keyword". Otherwise we have a cast exception