[PRMP-1085] Update GP2GP error message for clarity

Author: NogaNHS

lambdas/enums/document_review_reason.py

@@ -7,5 +7,5 @@ class DocumentReviewReason(StrEnum):
     DUPLICATE_RECORD = "Duplicate records error"
     FILE_COUNT_MISMATCH = "More or less files than we expected"
     FILE_NAME_MISMATCH = "Filename Naming convention error"
-    GP2GP_ERROR = "GP2GP error (placeholder)"
+    GP2GP_ERROR = "GP2GP failure"
     GENERAL_ERROR = "General error"