[WAR][nvbug/5321947] Add an async sleep to unblock event loop.

[FrankD412]

Description

This PR simply adds an asyncio.sleep(0) to force the event loop to take control from the iteration logging async task and process other tasks. This is a work around while sorting out #5299.

Test Coverage

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[FrankD412]

/bot run

[tensorrt-cicd]

PR_Github #9418 [ run ] triggered by Bot

[tensorrt-cicd]

PR_Github #9418 [ run ] completed with state SUCCESS
/LLM/main/L0_MergeRequest_PR pipeline #6912 completed with status: 'SUCCESS'
Pipeline passed with automatic retried tests. Check the rerun report for details.

[Superjomn]

LGTM