`pydantic-ai`: Stop setting transaction status

[alexander-alderman-webb]

AI integrations should not interfere with HTTP transactions.
Stop using the set_span_errored function:

sentry-python/sentry_sdk/tracing_utils.py

Line 1106 in 4cd6752

def set_span_errored(span: "Optional[Union[Span, StreamedSpan]]" = None) -> None:

[linear-code]

PY-2203