Fix GPT OSS template parser and test configuration
- Fix reasoning extraction to only tag content between <|message|> and <|end|>,
not the surrounding wrapper tokens
- Fix tool call parser to use <|call|> instead of <|end|> (matching template output)
- Simplify reasoning handling to apply to all messages with reasoning_content,
not just those with tool calls
- Change GPT OSS ToolsEmitContentWithCalls from Yes to No, as the template
doesn't support content alongside tool calls in a single message
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Co-Authored-By: Claude <noreply@anthropic.com>
