enh: Enable option in trtllm-bench build subcommand to avoid loading weights

[venkywonka]

PR title

Enable option in trtllm-bench build subcommand to avoid loading weights.

• Although measuring perf numbers with dummy weights is not recommended, for some cases when we just want to pipeclean or debug orthogonal parts with trtllm-bench build subcommand being the entry-point, we don't want to waste time waiting for the safetensors to load to memory (that's probably irrelevant to our objective).
• This shaves off several minutes of iterations - something like ~7 minutes on a 253B model by avoiding all those shards.

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[Copilot]

Pull Request Overview

This PR adds a new CLI option to the trtllm-bench build subcommand that allows users to bypass loading actual checkpoint weights in favor of dummy weights for performance and debugging purposes.

• Introduces a new option (--no_weights_loading) to control whether weights are loaded.
• Sets a new "load_format" based on that option, and passes it to the engine-building function.

[venkywonka]

@kaiyux @LarryXFly can I get an approval for merge?

[venkywonka]

/bot run --disable-fail-fast

[tensorrt-cicd]

PR_Github #4927 [ run ] triggered by Bot

[tensorrt-cicd]

PR_Github #4927 [ run ] completed with state SUCCESS
/LLM/main/L0_MergeRequest_PR pipeline #3575 completed with status: 'FAILURE'

[venkywonka]

@chzblych / @kaiyux please to review and unblock this PR

[venkywonka]

/bot run --disable-fail-fast

[tensorrt-cicd]

PR_Github #5218 [ run ] triggered by Bot

[tensorrt-cicd]

PR_Github #5218 [ run ] completed with state SUCCESS
/LLM/main/L0_MergeRequest_PR pipeline #3810 completed with status: 'FAILURE'

[venkywonka]

/bot run --disable-fail-fast

[tensorrt-cicd]

PR_Github #5349 [ run ] triggered by Bot

[tensorrt-cicd]

PR_Github #5349 [ run ] completed with state SUCCESS
/LLM/main/L0_MergeRequest_PR pipeline #3902 completed with status: 'SUCCESS'

[FrankD412]

/bot reuse-pipeline

[tensorrt-cicd]

PR_Github #5398 [ reuse-pipeline ] triggered by Bot

[tensorrt-cicd]

PR_Github #5398 [ reuse-pipeline ] completed with state SUCCESS
Reusing PR_Github #5349 for commit 20fde05