[frontend] use good StixType for Infrastucture link (#6400)

[frapuks]

Proposed changes

• fix Stix Object Type used in Infrastucture knowledge page (it impact the final link create to display relashionship)

Related issues

• close Link to relationship object to ObservedData objects in Infrastructure object is wrong #6400

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

All modified and coverable lines are covered by tests ✅

Project coverage is 67.95%. Comparing base (7b15b9c) to head (0d75a2a).
Report is 2 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #6469      +/-   ##
==========================================
+ Coverage   67.62%   67.95%   +0.32%     
==========================================
  Files         531      532       +1     
  Lines       64916    65002      +86     
  Branches     5409     5929     +520     
==========================================
+ Hits        43898    44170     +272     
+ Misses      21018    20832     -186     

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