[frontend] In Investigation, fix the display of a relationship after it has been created (#9022)

[Gwendoline-FAVRE-FELIX]

Proposed changes

• In an investigation, display the newly created relationship between two nodes, without needing to refresh the page.

Related issues

• In an investigation, you need to refresh the page after creating a new relationship to see it. #9022

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 64.68%. Comparing base (5087c95) to head (09120d6).
Report is 8 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #9077   +/-   ##
=======================================
  Coverage   64.68%   64.68%           
=======================================
  Files         620      620           
  Lines       59208    59208           
  Branches     6521     6523    +2     
=======================================
  Hits        38301    38301           
  Misses      20907    20907           

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