[TPU][Test] Rollback PR-21550.

[QiliangCui]

Purpose

Rollback #21550

Test Plan

Wait for CI Test to verify.

Test Result

FastCheck passed

[github-actions]

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[gemini-code-assist]

Code Review

This pull request rolls back a change to the gpu_memory_utilization parameter in a TPU test, lowering it from 0.95 to 0.7. This change is likely intended to improve the stability of the test by reducing the risk of out-of-memory errors. The change is straightforward and appears to be a safe adjustment for CI purposes. I have not found any high or critical issues in this change.