Prepare JAX test wrappers for rules_python 1.8.3 upgrade
Updating JAX test wrappers to accommodate stricter hermeticity introduced in rules_python 1.7.0+ https://rules-python.readthedocs.io/en/latest/changelog.html#v1-7.0 (sys.path order change and bootstraping)
These wrappers must be updated before the full rules_python 1.8.3 rollout because XLA relies on JAX for its CI workflows. Since XLA clones JAX during testing, these changes are required for the upgrade.
PiperOrigin-RevId: 868743606
