Implement "bad_indcies_policy" for ScatterNd.
Implement "bad_indcies_policy" for ScatterNd.

For testing, we also introduced "ScatterNdTest" that verifies the existing "default" behavior for comparison.

FUTURE_COPYBARA_INTEGRATE_REVIEW=https://github.com/openxla/xla/pull/13360 from Intel-tensorflow:akhil/vnni2_fp16 d138f97cb5004b199e626d4f705e50269b79e160
