[https://nvbugs/6337051][fix] Refresh inputs on graph capture to avoid unintended modification

[pengbowang-nv]

Description

Cuda graph capture will need to run warmup twice before actual capture. The warmup runs use identical input, but the forward_fn will modify the input, including attention metadata.

When MTP is present, it will increase KV len after execution. But page table of DSA is prepared before execution with old, shorter kv seq len. So on second run a OOB access will occur and dirty sparseIdx will lead to IMA.

This PR fixes the issue by refresh input data before every execution, and made sure to match one prepare to one execution (as our prepare_input function is stateful and have global effects).

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[pengbowang-nv]

/bot run --stage-list "GB200-12_GPUs-3_Nodes-PyTorch-Disagg-PerfSanity-CTX1-NODE1-GPU4-GEN1-NODE2-GPU8-Post-Merge-5,GB200-12_GPUs-3_Nodes-PyTorch-Disagg-PerfSanity-CTX1-NODE1-GPU4-GEN1-NODE2-GPU8-Post-Merge-7"

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PR_Github #57432 [ run ] completed with state FAILURE. Commit: a362541
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