Fix: remvoe async wrappers (#12405)

### What problem does this PR solve?

Fix: remvoe async wrappers  #12396

### Type of change

- [x] Bug Fix (non-breaking change which fixes an issue)

rag/svr/sync_data_source.py

@@ -113,7 +113,7 @@ class SyncBase:
         if task["poll_range_start"]:
             next_update = task["poll_range_start"]
 
-        async for document_batch in document_batch_generator:
+        for document_batch in document_batch_generator:
             if not document_batch:
                 continue
 
@@ -323,12 +323,12 @@ class Confluence(SyncBase):
             if pending_docs:
                 yield pending_docs
 
-        async def async_wrapper():
+        def wrapper():
             for batch in document_batches():
                 yield batch
 
         logging.info("Connect to Confluence: {} {}".format(self.conf["wiki_base"], begin_info))
-        return async_wrapper()
+        return wrapper()
 
 
 class Notion(SyncBase):
@@ -697,11 +697,11 @@ class WebDAV(SyncBase):
             begin_info
         ))
 
-        async def async_wrapper():
+        def wrapper():
             for document_batch in document_batch_generator:
                 yield document_batch
-                
-        return async_wrapper()
+
+        return wrapper()
 
 
 class Moodle(SyncBase):
@@ -911,7 +911,7 @@ class Github(SyncBase):
                     if next_checkpoint is not None:
                         checkpoint = next_checkpoint
 
-        async def async_wrapper():
+        def wrapper():
             for batch in document_batches():
                 yield batch
 
@@ -922,7 +922,7 @@ class Github(SyncBase):
             begin_info,
         )
 
-        return async_wrapper()
+        return wrapper()
 
 class IMAP(SyncBase):
     SOURCE_NAME: str = FileSource.IMAP
@@ -979,7 +979,7 @@ class IMAP(SyncBase):
             if pending_docs:
                 yield pending_docs
 
-        async def async_wrapper():
+        def wrapper():
             for batch in document_batches():
                 yield batch
 
@@ -991,7 +991,7 @@ class IMAP(SyncBase):
             self.conf["imap_mailbox"],
             begin_info
         )
-        return async_wrapper()
+        return wrapper()
 
 class Zendesk(SyncBase):
 
@@ -1061,7 +1061,7 @@ class Zendesk(SyncBase):
             if pending_docs:
                 yield pending_docs
 
-        async def async_wrapper():
+        def wrapper():
             for batch in document_batches():
                 yield batch
 
@@ -1071,7 +1071,7 @@ class Zendesk(SyncBase):
             begin_info,
         )
 
-        return async_wrapper()
+        return wrapper()
 
 
 class Gitlab(SyncBase):
@@ -1163,7 +1163,7 @@ class Bitbucket(SyncBase):
                         checkpoint = e.value
                         break
         
-        async def async_wrapper():
+        def wrapper():
             for batch in document_batches():
                 yield batch
 
@@ -1173,7 +1173,7 @@ class Bitbucket(SyncBase):
             begin_info,
         )
 
-        return async_wrapper()
+        return wrapper()
 
 func_factory = {
     FileSource.S3: S3,