[logging] Avoid attaching the logging handler to jax for "NOTSET".
Currently, to ensure logging is printing to stderr when enabled via jax config,
we attach our own logging handler to jax and jaxlib. This PR avoids attaching
the handler when level is "NOTSET" to default to the root logger instead.
Following the suggestion https://github.com/jax-ml/jax/issues/28360 by @Jacob-Stevens-Haas
PiperOrigin-RevId: 866592954
