[Data segregation] Enriching an observable removes sharing to organizations about opencti

[richard-julien]

Multiple problems here:

• Enrich must be done as the connector user and not the user that ask for enrich.
• The information of the granted_refs must not be lost by the enrich connector.

[JeremyCloarec]

I wasn't sure if the first problem was a design choice or a real problem

Also, correct me if I'm wrong, but think there are two different parts to the problem of granted_refs being lost by the enrich connector.
After fixing the granted_refs being lost for the enriched entity, we should also apply the granted_refs to the entities created during the enrichment with a relationship to the entity.

I've been working on it for some time, but I'm struggling to find a proper fix for it currently

[richard-julien]

Seems the same problem as #5856

[richard-julien]

Will be handled by #6042