Make document change-status idempotent for Infinity doc store (#12717)

### What problem does this PR solve?

This PR makes the document change‑status endpoint idempotent under the
Infinity doc store. If a document already has the requested status, the
handler returns success without touching the engine, preventing
unnecessary updates and avoiding missing‑table errors while keeping
responses consistent.

### Type of change

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

test/testcases/test_sdk_api/test_session_management/conftest.py

@@ -25,8 +25,7 @@ def add_sessions_with_chat_assistant(request: FixtureRequest, add_chat_assistant
         for chat_assistant in chat_assistants:
             try:
                 chat_assistant.delete_sessions(ids=None)
-            except Exception as e:
-                print(f"Exception: {e}")
+            except Exception :
                 pass
 
     request.addfinalizer(cleanup)
@@ -41,8 +40,8 @@ def add_sessions_with_chat_assistant_func(request: FixtureRequest, add_chat_assi
         for chat_assistant in chat_assistants:
             try:
                 chat_assistant.delete_sessions(ids=None)
-            except Exception as e:
-                print(f"Exception: {e}")
+            except Exception :
+                pass
 
     request.addfinalizer(cleanup)