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feat: Add reasoning support for HuggingFaceAPIChatGenerator (#9701) (#10248)

* feat: add reasoning support for HuggingFaceAPIChatGenerator

Add reasoning field extraction for both streaming and non-streaming modes
in HuggingFaceAPIChatGenerator, aligning with the parent issue #9700
initiative to standardize reasoning support across all ChatGenerators.

Changes:
- Extract reasoning from choice.message.reasoning in non-streaming mode
- Extract reasoning from choice.delta.reasoning in streaming mode
- Accumulate reasoning chunks in streaming and create final ReasoningContent
- Add backward compatibility check using hasattr() for API responses
- Add 11 comprehensive tests covering all reasoning scenarios

The reasoning content is stored in ChatMessage.reasoning field (not meta),
following the pattern established in PR #9696.

Closes #9701
Ref #9700

* fix: skip ReasoningContent in convert_message_to_hf_format for multi-turn

Address PR review feedback:
- Update convert_message_to_hf_format to explicitly skip ReasoningContent
  during conversion (HF API doesn't support reasoning in input messages)
- Add multi-turn integration test with reasoning model
- Add unit tests for ReasoningContent handling in conversion

* fix: use reStructuredText formatting in release note

Convert Markdown to reStructuredText:
- Use double backticks for inline code
- Use .. code:: python directive for code blocks

* refactor: extract common reasoning extraction logic into helper function

Address review feedback from @mpangrazzi:
- Extract duplicated reasoning extraction code into _extract_reasoning_content()
- Use helper function in streaming, sync, and async methods
- Shorten release note to be more concise

* test: increase max_tokens to 300 in multi-turn HuggingFaceAPIChatGenerator integration test for stability

---------

Co-authored-by: Michele Pangrazzi <xmikex83@gmail.com>

14151 of 15351 relevant lines covered (92.18%)

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ID Job ID Ran Files Coverage
1 20371470877.1 244
92.18
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