Refa:replace trio with asyncio (#11831)

### What problem does this PR solve?

change:
replace trio with asyncio

### Type of change
- [x] Refactoring

api/utils/api_utils.py

@@ -14,6 +14,7 @@
 #  limitations under the License.
 #
 
+import asyncio
 import functools
 import inspect
 import json
@@ -25,7 +26,6 @@ from functools import wraps
 from typing import Any
 
 import requests
-import trio
 from quart import (
     Response,
     jsonify,
@@ -681,18 +681,37 @@ async def is_strong_enough(chat_model, embedding_model):
     async def _is_strong_enough():
         nonlocal chat_model, embedding_model
         if embedding_model:
-            with trio.fail_after(10):
-                _ = await trio.to_thread.run_sync(lambda: embedding_model.encode(["Are you strong enough!?"]))
+            await asyncio.wait_for(
+                asyncio.to_thread(embedding_model.encode, ["Are you strong enough!?"]),
+                timeout=10
+            )
+
         if chat_model:
-            with trio.fail_after(30):
-                res = await trio.to_thread.run_sync(lambda: chat_model.chat("Nothing special.", [{"role": "user", "content": "Are you strong enough!?"}], {}))
-            if res.find("**ERROR**") >= 0:
+            res = await asyncio.wait_for(
+                asyncio.to_thread(
+                    chat_model.chat,
+                    "Nothing special.",
+                    [{"role": "user", "content": "Are you strong enough!?"}],
+                    {}
+                ),
+                timeout=30
+            )
+            if "**ERROR**" in res:
                 raise Exception(res)
 
     # Pressure test for GraphRAG task
-    async with trio.open_nursery() as nursery:
-        for _ in range(count):
-            nursery.start_soon(_is_strong_enough)
+    tasks = [
+        asyncio.create_task(_is_strong_enough())
+        for _ in range(count)
+    ]
+    try:
+        await asyncio.gather(*tasks, return_exceptions=False)
+    except Exception as e:
+        logging.error(f"Pressure test failed: {e}")
+        for t in tasks:
+            t.cancel()
+        await asyncio.gather(*tasks, return_exceptions=True)
+        raise
 
 
 def get_allowed_llm_factories() -> list: