Update TFDS MLPerf data input pipeline

[RissyRan]

Description

Enable the dataset loading for MLPerf 6.0 DeepSeek V3.

Tests

Expect tests are green.

Local tests:

• load new dataset: link

dataset_path=gs://mlperf-6-submission/tfds \
dataset_name='c4/en:3.0.5' \
eval_dataset_name='c4/en:3.0.5' \

• load old dataset: link

dataset_path=gs://max-datasets-rogue \
dataset_name='c4/en:3.0.7' \
eval_dataset_name='c4/en:3.0.9' \

Checklist

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• I have performed a self-review of my code. For an optional AI review, add the gemini-review label.
• I have necessary comments in my code, particularly in hard-to-understand areas.
• I have run end-to-end tests tests and provided workload links above if applicable.
• I have made or will make corresponding changes to the doc if needed, including adding new documentation pages to the relevant Table of Contents (toctree directive) as explained in our documentation.

[codecov]

Codecov Report

❌ Patch coverage is 0% with 22 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
...t/input_pipeline/tfds_data_processing_c4_mlperf.py	0.00%	18 Missing ⚠️
src/maxtext/input_pipeline/input_pipeline_utils.py	0.00%	4 Missing ⚠️

📢 Thoughts on this report? Let us know!

[shuningjin]

Thanks, LGTM! Left some minor comments. The gpu test has been fixed at head; please sync.

[suexu1025]

some cases needs to adjust for compatibility