[CSV mapper]Container doesn't include relationships

[yassine-ouaamou]

Description

In a CSV mapper, when adding entities inside a container while having mapped relationships between these entities, the relationships are created but not included in the container

Environment

Testing

Reproducible Steps

Steps to create the smallest reproducible scenario:

1. Create a CSV mapper as follows:
   
2. Import the following CSV using that mapper: reports.csv

Expected Output

Actual Output

Additional information

The relationship between intrusion set and country has been created but is not included in the report.

Screenshots (optional)

[yassine-ouaamou]

A mapper called "issue 9395" has been created in testing to illustrate this behaviour. Feel free to use it

[nino-filigran]

Reproduced with @yassine-ouaamou.