fix(backend): invitation with new brains did not work (#2378)

# Description

Please include a summary of the changes and the related issue. Please
also include relevant motivation and context.

## Checklist before requesting a review

Please delete options that are not relevant.

- [ ] My code follows the style guidelines of this project
- [ ] I have performed a self-review of my code
- [ ] I have commented hard-to-understand areas
- [ ] I have ideally added tests that prove my fix is effective or that
my feature works
- [ ] New and existing unit tests pass locally with my changes
- [ ] Any dependent changes have been merged

## Screenshots (if appropriate):

backend/modules/brain/service/brain_service.py

@@ -328,29 +328,12 @@ class BrainService:
         if brain == None:
             return None
 
-        if brain.brain_type == BrainType.API:
-            brain_definition = api_brain_definition_service.get_api_brain_definition(
-                brain_id
-            )
-            brain.brain_definition = brain_definition
-
-        if brain.brain_type == BrainType.COMPOSITE:
-            brain.connected_brains_ids = (
-                self.composite_brains_connections_repository.get_connected_brains(
-                    brain_id
-                )
-            )
         if brain.brain_type == BrainType.INTEGRATION:
             brain.integration = (
                 self.integration_brains_repository.get_integration_brain(
                     brain_id, user_id
                 )
             )
-            brain.integration_description = (
-                self.integration_description_repository.get_integration_description(
-                    brain.integration.integration_id
-                )
-            )
         return brain
 
     def get_connected_brains(self, brain_id: UUID) -> list[BrainEntity]: