[backend] Test CSV bundler with Indicators with external references …

[Goumies]

Closes #6287

Proposed changes

• Add test to make sure to spot unexpected import with external references

Related issues

• https://github.com/OpenCTI-Platform/opencti/issues/6287

Checklist

• [x] I consider the submitted work as finished
• [x] 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

Self-assigned this bug a few months ago. It is not reproducible anymore, since the 16th of may.

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 67.42%. Comparing base (c404e40) to head (2e2a7d8). Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #6995      +/-   ##
==========================================
+ Coverage   67.37%   67.42%   +0.04%     
==========================================
  Files         563      563              
  Lines       69626    69643      +17     
  Branches     5886     5893       +7     
==========================================
+ Hits        46909    46955      +46     
+ Misses      22717    22688      -29     

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