Fix precommit check after moving to ruff (#927)

Lint check in main branch is failing. This fixes the lint check after we
moved to ruff in https://github.com/meta-llama/llama-stack/pull/921. We
need to move to a `ruff.toml` file as well as fixing and ignoring some
additional checks.

Signed-off-by: Yuan Tang <terrytangyuan@gmail.com>

llama_stack/providers/utils/telemetry/dataset_mixin.py

@@ -64,8 +64,7 @@ class TelemetryDatasetMixin:
 
             for span in spans_by_id_resp.data.values():
                 if span.attributes and all(
-                    attr in span.attributes and span.attributes[attr] is not None
-                    for attr in attributes_to_return
+                    attr in span.attributes and span.attributes[attr] is not None for attr in attributes_to_return
                 ):
                     spans.append(
                         Span(