[TEST] DS v3.2 optimization from agents

[RissyRan]

Description

Tests: https://paste.googleplex.com/6527936233603072

Tests

Please describe how you tested this change, and include any instructions and/or
commands to reproduce.

Checklist

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• 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 38.83929% with 137 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
src/maxtext/layers/attention_mla.py	38.83%	131 Missing and 6 partials ⚠️

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