community: Update azureml endpoint (#28953)

- In this PR, I have updated the AzureML Endpoint with the latest
endpoint.
- **Description:** I have changed the existing `/chat/completions` to
`/models/chat/completions` in
libs/community/langchain_community/llms/azureml_endpoint.py
    - **Issue:** #25702

---------

Co-authored-by: = <=>

Author: ashvin-a

libs/community/langchain_community/llms/azureml_endpoint.py

@@ -434,7 +434,8 @@ def validate_endpoint_url(cls, field_value: Any) -> str:
             raise ValueError(
                 "`endpoint_url` should contain the full invocation URL including "
                 "`/score` for `endpoint_api_type='dedicated'` or `/completions` "
-                "or `/chat/completions` for `endpoint_api_type='serverless'`"
+                "or `/chat/completions` or `/models/chat/completions` "
+                "for `endpoint_api_type='serverless'`"
             )
         return field_value
 
@@ -455,16 +456,19 @@ def validate_endpoint_api_type(
                 "Endpoints of type `dedicated` should follow the format "
                 "`https://<your-endpoint>.<your_region>.inference.ml.azure.com/score`."
                 " If your endpoint URL ends with `/completions` or"
-                "`/chat/completions`, use `endpoint_api_type='serverless'` instead."
+                "`/chat/completions` or `/models/chat/completions`,"
+                "use `endpoint_api_type='serverless'` instead."
             )
         if field_value == AzureMLEndpointApiType.serverless and not (
             endpoint_url.endswith("/completions")  # type: ignore[union-attr]
             or endpoint_url.endswith("/chat/completions")  # type: ignore[union-attr]
+            or endpoint_url.endswith("/models/chat/completions")  # type: ignore[union-attr]
         ):
             raise ValueError(
                 "Endpoints of type `serverless` should follow the format "
-                "`https://<your-endpoint>.<your_region>.inference.ml.azure.com/chat/completions`"
+                "`https://<your-endpoint>.<your_region>.inference.ml.azure.com/completions`"
                 " or `https://<your-endpoint>.<your_region>.inference.ml.azure.com/chat/completions`"
+                " or `https://<your-endpoint>.<your_region>.inference.ml.azure.com/models/chat/completions`"
             )
 
         return field_value