Removing a relation in a grouping knowledge graph removes it in all containers

[JeremyCloarec]

Description

When removing a relation from a groupings graph, the relation is deleted even if it is contained in an other container.

Reproducible Steps

1. Create a new report
2. Go to the knowledge graph, add two entities and create a relationship between them
3. Create a new grouping
4. Go to the knowledge graph, add the two same entities and add the same relationship between them
5. Remove this relationship

Expected Output

The relationship still being there in the report

Actual Output

The relationship is deleted

Additional information

We are forced to do a cascade remove in groupings, but in reports we are prompted to choose between only removing the relation in this container or if we want to do a cascade remove. Maybe we also want to add this option in groupings and other containers?