[Cherry-Pick] Fix finish reason in _create_chat_completion_choice (#4582) #4716
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Motivation
Fix finish reason in _create_chat_completion_choice
Fix offline chat interface does not activate the enable_thinking parameter even when set to True.
Modifications
Fixed the issue where the _create_chat_completion_choice function was retrieving values from the output field instead of the data field.
Modify the initial value of the enable_thinking parameter in the Request to None, and modify the assignment logic in the processor.
Usage or Command
Accuracy Tests
Checklist
[FDConfig],[APIServer],[Engine],[Scheduler],[PD Disaggregation],[Executor],[Graph Optimization],[Speculative Decoding],[RL],[Models],[Quantization],[Loader],[OP],[KVCache],[DataProcessor],[BugFix],[Docs],[CI],[Optimization],[Feature],[Benchmark],[Others],[XPU],[HPU],[GCU],[DCU],[Iluvatar],[Metax]]pre-commitbefore commit.releasebranch, make sure the PR has been submitted to thedevelopbranch, then cherry-pick it to thereleasebranch with the[Cherry-Pick]PR tag.