[BUG] Exclude .pth files when pulling remote files

[ahao-anyscale]

Purpose

When pulling files for model and tokenizer in maybe_pull_model_tokenizer_for_runai, *.pth files are not excluded from being pulled. Some huggingface repos like https://huggingface.co/meta-llama/Meta-Llama-3-8B-Instruct/tree/main/original contain .pth files, which adds a significant amount of unnecessary latency to startup times.

Test Plan

I timed the ModelConfig creation time and ensured that the startup latency went down.

Test Result

N/A

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• The purpose of the PR, such as "Fix some issue (link existing issues this PR will resolve)".
• The test plan, such as providing test command.
• The test results, such as pasting the results comparison before and after, or e2e results
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