Test: Improve model re-use in C++ DGX tests for CI stability

[DomBrown]

PR title

Test: Improve model re-use in C++ DGX tests for CI stability

Description

We continue to observe poor throughput of the DGX tests in CI.
This PR aims to speed up the C++ DGX tests stage slightly by reusing already built model engines and expected outputs, where possible.

Some test cases have also been further split to improve granularity and reporting.

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run [--disable-fail-fast --skip-test --stage-list "A10-1, xxx" --gpu-type "A30, H100_PCIe" --add-multi-gpu-test --only-multi-gpu-test --disable-multi-gpu-test --post-merge --extra-stage "H100_PCIe-[Post-Merge]-1, xxx"]

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kill

kill

Kill all running builds associated with pull request.

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[DomBrown]

/bot run --stage-list "DGX_H100-4_GPUs-CPP-1"

[tensorrt-cicd]

PR_Github #5005 [ run ] triggered by Bot

[tensorrt-cicd]

PR_Github #5005 [ run ] completed with state FAILURE
/LLM/main/L0_MergeRequest_PR pipeline #3638 (Partly Tested) completed with status: 'FAILURE'

[DomBrown]

/bot run --stage-list "DGX_H100-4_GPUs-CPP-1"

[tensorrt-cicd]

PR_Github #5008 [ run ] triggered by Bot

[tensorrt-cicd]

PR_Github #5008 [ run ] completed with state SUCCESS
/LLM/main/L0_MergeRequest_PR pipeline #3641 (Partly Tested) completed with status: 'SUCCESS'

[DomBrown]

Model re-use seems to knock ~10 minutes off of the pipeline (DGX C++)

[DomBrown]

/bot run --stage-list "DGX_H100-4_GPUs-CPP-1"

[tensorrt-cicd]

PR_Github #5371 [ run ] triggered by Bot

[tensorrt-cicd]

PR_Github #5371 [ run ] completed with state SUCCESS
/LLM/main/L0_MergeRequest_PR pipeline #3920 (Partly Tested) completed with status: 'SUCCESS'

[DomBrown]

/bot run

[tensorrt-cicd]

PR_Github #5397 [ run ] triggered by Bot

[tensorrt-cicd]

PR_Github #5397 [ run ] completed with state SUCCESS
/LLM/main/L0_MergeRequest_PR pipeline #3939 completed with status: 'FAILURE'

[DomBrown]

/bot run

[tensorrt-cicd]

PR_Github #5526 [ run ] triggered by Bot

[DomBrown]

/bot run

[tensorrt-cicd]

PR_Github #5607 [ run ] triggered by Bot

[tensorrt-cicd]

PR_Github #5607 [ run ] completed with state SUCCESS
/LLM/main/L0_MergeRequest_PR pipeline #4092 completed with status: 'FAILURE'

[DomBrown]

/bot run

[tensorrt-cicd]

PR_Github #5621 [ run ] triggered by Bot

[tensorrt-cicd]

PR_Github #5621 [ run ] completed with state SUCCESS
/LLM/main/L0_MergeRequest_PR pipeline #4106 completed with status: 'SUCCESS'