[Misc] Clean up unnecessary checks in chromadb vector store integration (#2284)

mem0/vector_stores/chroma.py

@@ -104,12 +104,6 @@ class ChromaDB(VectorStoreBase):
         Returns:
             chromadb.Collection: The created or retrieved collection.
         """
-        # Skip creating collection if already exists
-        collection_info = self.client.get_collection(name=name)
-        if collection_info:
-            logging.debug(f"Collection {name} already exists. Skipping creation.")
-            return collection_info
-
         collection = self.client.get_or_create_collection(
             name=name,
             embedding_function=embedding_fn,