FINERACT-2720: Scope entity-to-entity mapping results to user office hierarchy

[aya-abdallah-FOO]

Description

When the All option is selected in the Office dropdown on the Entity-to-Entity Mapping screen (System → Entity to Entity Mapping), the API returns mappings across all offices
in the system, including branches the authenticated user has no access to. This violates office-level access restrictions.

Root cause: retrieveEntityToEntityMappings treats fromId = 0 (the "All" sentinel) as a pass-through, so the SQL returns every row regardless of the caller's office
hierarchy.

Fix

When fromId == 0 and the relation's from_entity_type is 1 (office), a recursive CTE (WITH RECURSIVE office_descendants) scopes results to only the authenticated user's
office and its descendants. Non-office relation types fall through to the existing query unchanged.

Testing

• A user in a non-root office sees only their office (and child offices) in the Entity-to-Entity Mapping dropdown — not "All" or unrelated branches.
• :fineract-provider:compileJava and :fineract-provider:compileTestJava pass clean

FINERACT-2720