Fix: Fixes graph completion search limit (#839)

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## Description
Fixes graph completion limit

## DCO Affirmation
I affirm that all code in every commit of this pull request conforms to
the terms of the Topoteretes Developer Certificate of Origin.

cognee/modules/retrieval/utils/brute_force_triplet_search.py

@@ -146,7 +146,7 @@ async def brute_force_search(
     async def search_in_collection(collection_name: str):
         try:
             return await vector_engine.search(
-                collection_name=collection_name, query_text=query, limit=50
+                collection_name=collection_name, query_text=query, limit=0
             )
         except CollectionNotFoundError:
             return []