Add sleep function for disagg gen-only benchmarking

[qiaoxj07]

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[TRTLLM-1000][feat] Support a new feature about cache manager

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[qiaoxj07]

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[tensorrt-cicd]

PR_Github #9580 [ run ] triggered by Bot

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PR_Github #9580 [ run ] completed with state SUCCESS
/LLM/main/L0_MergeRequest_PR pipeline #7036 completed with status: 'FAILURE'

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/bot run

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PR_Github #9682 [ run ] triggered by Bot

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PR_Github #9778 [ run ] triggered by Bot

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PR_Github #9802 [ run ] completed with state SUCCESS
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/bot run --disable-fail-fast

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PR_Github #9870 [ run ] completed with state SUCCESS
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/bot reuse-pipeline

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PR_Github #9929 [ reuse-pipeline ] completed with state SUCCESS
Reusing PR_Github #9870 for commit 6746503