Fix message channel processing (#12021)

Several users have complained about not being able to read their emails
anymore.

This is because the find-messages post query hook is expecting
ObjectRecord[] as an input but is actually getting a graphql Connection

Typing was wrong. This PR fixes the typing and make sure the post query
hook always get an ObjectRecord[]

packages/twenty-server/src/engine/api/graphql/graphql-query-runner/errors/graphql-query-runner.exception.ts

@@ -24,4 +24,5 @@ export enum GraphqlQueryRunnerExceptionCode {
   RELATION_TARGET_OBJECT_METADATA_NOT_FOUND = 'RELATION_TARGET_OBJECT_METADATA_NOT_FOUND',
   NOT_IMPLEMENTED = 'NOT_IMPLEMENTED',
   OBJECT_METADATA_COLLECTION_NOT_FOUND = 'OBJECT_METADATA_COLLECTION_NOT_FOUND',
+  INVALID_POST_HOOK_PAYLOAD = 'INVALID_POST_HOOK_PAYLOAD',
 }