chore(openai): use SpanAttributes.EMBEDDING_INVOCATION_PARAMETERS

[codefromthecrypt]

Remove hardcoded constant and outdated TODO comment. Use the official SpanAttributes.EMBEDDING_INVOCATION_PARAMETERS constant that was released in semantic conventions v0.1.25.

Bump openinference-semantic-conventions from >=0.1.23 to >=0.1.25.

---

Note

Serialize non-string tool/function outputs to JSON for agents and switch embeddings attribute to the official SpanAttributes constant, with dependency bump and minor mypy config tweak.

• OpenAI Agents Instrumentation:
  • JSON-serialize non-string output values for custom_tool_call_output and function_call_output; skip emitting content when output is None.
  • Expand tests to cover string, list, and dict outputs for both paths.
  • Mypy: add per-test override to disable warn_unused_ignores due to OpenAI type version differences.
• OpenAI Instrumentation:
  • Replace custom embedding invocation parameter key with SpanAttributes.EMBEDDING_INVOCATION_PARAMETERS.
  • Bump openinference-semantic-conventions to >=0.1.25.

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