[frontend] fix unable to expand indicators based on file (#8831)

[marieflorescontact]

Proposed changes

• Add missing Hashes for StixFile in InvestigationGraphStixRelationshipsQuery

Related issues

• Investigation: Unable to expand any indicators linked to a file obervable #8831
• fixes also Investigation: cannot expand observables of type File #8908

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

All modified and coverable lines are covered by tests ✅

Project coverage is 66.30%. Comparing base (f4296f8) to head (a2309a5).
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #8933      +/-   ##
==========================================
+ Coverage   66.29%   66.30%   +0.01%     
==========================================
  Files         597      597              
  Lines       61035    61035              
  Branches     6276     6280       +4     
==========================================
+ Hits        40463    40470       +7     
+ Misses      20572    20565       -7     

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