Move var from rag.settings to common.globals (#11022)

### What problem does this PR solve?

As title.

### Type of change

- [x] Refactoring

---------

Signed-off-by: Jin Hai <haijin.chn@gmail.com>

rag/utils/redis_conn.py

@@ -19,8 +19,8 @@ import json
 import uuid
 
 import valkey as redis
-from rag import settings
 from common.decorator import singleton
+from common import globals
 from valkey.lock import Lock
 import trio
 
@@ -61,7 +61,7 @@ class RedisDB:
 
     def __init__(self):
         self.REDIS = None
-        self.config = settings.REDIS
+        self.config = globals.REDIS
         self.__open__()
 
     def register_scripts(self) -> None: