tests: [TRTQA-2905] improve timeout report for qa test cases

[crazydemo]

Description

This PR provides the following improvement:

1. set timeout for mpi run, to make sure mpi run will exit normally when the case exceeds the time limit.
2. set addition time limits for long-running cases.
3. check the cpu load when build flash-attn, use an dynamic optimal strategy to set the max_jobs rather than set max_jobs = 4.

Test Coverage

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[crazydemo]

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[tensorrt-cicd]

PR_Github #6921 [ run ] triggered by Bot

[tensorrt-cicd]

PR_Github #6921 [ run ] completed with state SUCCESS
/LLM/main/L0_MergeRequest_PR pipeline #5023 completed with status: 'FAILURE'