chore:Remove duplicate code, lines 8 to 27, same as lines 29 & 45 to 62. (#13659)

Co-authored-by: 刘江波 <jiangbo721@163.com>

api/fields/message_fields.py

@@ -7,27 +7,6 @@ from .raws import FilesContainedField
 
 feedback_fields = {"rating": fields.String}
 
-retriever_resource_fields = {
-    "id": fields.String,
-    "message_id": fields.String,
-    "position": fields.Integer,
-    "dataset_id": fields.String,
-    "dataset_name": fields.String,
-    "document_id": fields.String,
-    "document_name": fields.String,
-    "data_source_type": fields.String,
-    "segment_id": fields.String,
-    "score": fields.Float,
-    "hit_count": fields.Integer,
-    "word_count": fields.Integer,
-    "segment_position": fields.Integer,
-    "index_node_hash": fields.String,
-    "content": fields.String,
-    "created_at": TimestampField,
-}
-
-feedback_fields = {"rating": fields.String}
-
 agent_thought_fields = {
     "id": fields.String,
     "chain_id": fields.String,