[frontend] fix remove relation ref from Grouping Knowledge graph (#6482)

[Archidoit]

issues:

• Nested refs are not properly removed in groupings knowledge graph #6482
• Cascade remove in report knowledge graph is not working as expected #6486
• Removing a relation in a grouping knowledge graph removes it in all containers #6484

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 67.70%. Comparing base (c08cb0e) to head (b9ebf10).
Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #6491   +/-   ##
=======================================
  Coverage   67.70%   67.70%           
=======================================
  Files         532      532           
  Lines       64989    64989           
  Branches     5444     5445    +1     
=======================================
+ Hits        43998    43999    +1     
+ Misses      20991    20990    -1     

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[labo-flg]

Agreed with Jeremy, we shall check in all other types of containers.

[JeremyCloarec]

Tested OK, great job! Love the refactoring into KnowledgeGraphQuery!
Looks like the build is only failing because of some remaining console logs in GroupingKnowledgeGraph