[Cherry-Pick]Allows tools and content to coexist.(#6656)

[luukunn]

Motivation

💡 If this PR is a Cherry Pick, the PR title needs to follow the format by adding the [Cherry-Pick] label at the very beginning and appending the original PR ID at the end. For example, [Cherry-Pick][CI] Add check trigger and logic(#5191)

💡 如若此PR是Cherry Pick，PR标题需遵循格式，在最开始加上[Cherry-Pick]标签，以及最后面加上原PR ID，例如[Cherry-Pick][CI] Add check trigger and logic(#5191)

Modifications

Usage or Command

Accuracy Tests

Checklist

• Add at least a tag in the PR title.
  • Tag list: [[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]]
  • You can add new tags based on the PR content, but the semantics must be clear.
• Format your code, run pre-commit before commit.
• Add unit tests. Please write the reason in this PR if no unit tests.
• Provide accuracy results.
• If the current PR is submitting to the release branch, make sure the PR has been submitted to the develop branch, then cherry-pick it to the release branch with the [Cherry-Pick] PR tag.

[paddle-bot]

Thanks for your contribution!

[Copilot]

Pull request overview

该 PR 旨在调整文本后处理逻辑：当解析到 tool_calls 时，不再用工具解析结果覆盖原有 text 字段，以便在同一次回复中同时返回自然语言内容与工具调用信息（更贴近 OpenAI “content + tool_calls 可共存”的语义）。

Changes:

• 在 process_response() 中，检测到 tool_calls 时不再覆盖 response_dict.outputs.text。
• 在 process_response_dict_normal() 中，检测到 tool_calls 时不再覆盖 response_dict["outputs"]["text"]。

[Copilot]

当前 DataProcessor 在检测到 tool_calls 时不再用 tool_call_info.content 覆盖 text；但 fastdeploy/input/ernie4_5_processor.py 仍会覆盖 text（会导致 tool_calls + 文本共存行为在不同 processor 间不一致）。如果这是一个全局语义变更，建议同步修改 Ernie4_5Processor，或在此处说明仅适用于 text_processor 的原因。

[Copilot]

PR 标题未完全符合仓库 Cherry-Pick 规范：除了开头的 [Cherry-Pick] 外，通常还需要至少一个语义标签（如 [BugFix]/[Feature]/[APIServer] 等），并将原始 PR 号以 "(#6656)" 形式附在标题末尾。建议按模板示例调整标题格式以通过 CI 校验。

[Copilot]

PR 描述目前仍是模板占位（Motivation/Modifications/Usage/Tests 未填写）。建议补充：为何需要允许 tool_calls 与 content 共存、影响哪些模型/接口、以及是否做过回归或对齐 OpenAI tool_calls 行为的测试。

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
⚠️ Please upload report for BASE (release/2.4@4516c58). Learn more about missing BASE report.

Additional details and impacted files

@@              Coverage Diff               @@
##             release/2.4    #6996   +/-   ##
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  Coverage               ?   56.03%           
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  Files                  ?      333           
  Lines                  ?    42570           
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  Hits                   ?    23855           
  Misses                 ?    16831           
  Partials               ?     1884           

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