[V1][Bug]: Consider sampler in memory profiling

[WoosukKwon]

Your current environment

The output of `python collect_env.py`

Your output of `python collect_env.py` here

🐛 Describe the bug

Currently, V1 model runner does not consider (or run) sampler during the initial memory profiling. This should be fixed 1) for more accurate memory profiling and 2) to warm up the sampler before processing any real requests.

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