fix(ci): fix assemblyai custom auth and router wildcard test flakiness

1. custom_auth_basic.py: Add user_role='proxy_admin' so the custom auth
   user can access management endpoints like /key/generate. The test
   test_assemblyai_transcribe_with_non_admin_key was hidden behind an
   earlier -x failure and was never reached before.

2. test_router_utils.py: Add flaky(retries=3) and increase sleep from 1s
   to 2s for test_router_get_model_group_usage_wildcard_routes. The async
   callback needs time to write usage to cache, and 1s is insufficient on
   slower CI hardware.

Co-authored-by: Ishaan Jaff <ishaan-jaff@users.noreply.github.com>

litellm/proxy/example_config_yaml/custom_auth_basic.py

@@ -9,6 +9,7 @@ async def user_api_key_auth(request: Request, api_key: str) -> UserAPIKeyAuth:
             api_key="best-api-key-ever",
             user_id="best-user-id-ever",
             team_id="best-team-id-ever",
+            user_role="proxy_admin",
         )
     except Exception:
         raise Exception

tests/local_testing/test_router_utils.py

@@ -199,6 +199,7 @@ def test_router_get_model_info_wildcard_routes():
 
 
 @pytest.mark.asyncio
+@pytest.mark.flaky(retries=3, delay=1)
 async def test_router_get_model_group_usage_wildcard_routes():
     os.environ["LITELLM_LOCAL_MODEL_COST_MAP"] = "True"
     litellm.model_cost = litellm.get_model_cost_map(url="")
@@ -219,7 +220,7 @@ async def test_router_get_model_group_usage_wildcard_routes():
     )
     print(resp)
 
-    await asyncio.sleep(1)
+    await asyncio.sleep(2)
 
     tpm, rpm = await router.get_model_group_usage(model_group="gemini/gemini-1.5-flash")