Revert part of #5319: don't use `traceback_util.path_starts` in `source_info_util.user_frame`.
Revert part of #5319: don't use `traceback_util.path_starts` in `source_info_util.user_frame`.

The issue was that it incurs filesystem accesses while we're lowering to XLA, which can cause a significant slowdown.

PiperOrigin-RevId: 352662434

google/jax,google/jax,google/jax,google/jax