[DECOUPLED-MODE] Add ICI parallelism logic for decoupled mode for partial rotary embedding test

[gulsumgudukbay]

Description

Add ICI parallelism logic for decoupled mode for partial rotary embedding test

Tests

Tests passing in decoupled mode

Checklist

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• I have necessary comments in my code, particularly in hard-to-understand areas.
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• 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

✅ All modified and coverable lines are covered by tests.

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