fix: set `clean_up_tokenization_spaces=False` in Llama 3 tokenizer conversion (#44914)
fix: set clean_up_tokenization_spaces=False in Llama 3 tokenizer conversion
The Llama3Converter hardcodes clean_up_tokenization_spaces=True, which
applies BERT-era string replacements (` .` → `.`, ` !` → `!`, etc.)
that silently corrupt decoded text from Llama 3's BPE tokenizer.
Llama 2's LlamaTokenizer and Llama 4 both use False. The True was
introduced in PR #30334 and hardcoded in PR #33778 for backward compat.
Fixes #35175