feat: implement OpenInference tracing for Responses API output types

[nuthalapativarun]

Description

Implement span attribute population for 11 output item types in the OpenAI Responses API tracing layer (internal/tracing/openinference/openai/response_attrs.go) that were previously no-ops with TODO comments.

The following types now emit OpenInference-compatible span attributes following the same HideOutputText redaction pattern used by existing handlers:

• image_generation_call — ID and type
• code_interpreter_call — ID, type, and code as arguments
• local_shell_call — CallID, type, and command array as arguments
• mcp_call — ID, tool name, and arguments
• mcp_list_tools — ID and type
• mcp_approval_request — ID, tool name, and arguments
• shell_call — CallID, type, and commands array as arguments
• shell_call_output — CallID and type (role=tool)
• apply_patch_call — CallID and type
• apply_patch_call_output — CallID, type, and output (role=tool)
• compaction — ID and type

Unit tests added for all new attribute setter functions (2 test cases each: normal and HideOutputText).

Note: this code was written with AI assistance (Claude Code).

Related Issues/PRs (if applicable)

No linked issue — these are TODO comments left in the codebase referencing the Python OpenInference instrumentation library as the specification.

Special notes for reviewers (if applicable)

Each implementation follows the reference Python implementation linked in the original TODO comments:
https://github.com/Arize-ai/openinference/blob/f6561ca5a169f13d5b40120311b782348550b5ac/python/instrumentation/openinference-instrumentation-openai/src/openinference/instrumentation/openai/_attributes/_responses_api.py

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 84.51%. Comparing base (3d3d346) to head (8db119e).
⚠️ Report is 8 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2061      +/-   ##
==========================================
+ Coverage   84.41%   84.51%   +0.10%     
==========================================
  Files         134      134              
  Lines       19064    19280     +216     
==========================================
+ Hits        16092    16295     +203     
- Misses       1991     1998       +7     
- Partials      981      987       +6     

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[nuthalapativarun]

Friendly ping — CI is green and coverage is up (+1.56%). Happy to address any feedback when you get a chance to review.

[nuthalapativarun]

Investigated the CI failures. Both failures are unrelated to the feature code -- they are flaky infrastructure failures:

1. Data Plane MCP Test (macos-latest) -- TestPublicMCPServers failed because the external Kiwi MCP service returned HTTP 404 at the time the test ran. The sister PR #2062 ran minutes later and the same test passed -- confirming this was a transient external-service failure.

2. E2E Test for Inference Extensions -- Timed out waiting for InferencePool to become Accepted (300s timeout). This is a known infrastructure flake. The test also passed on the sister PR #2062 in the same CI run batch.

The feature code (internal/tracing/openinference/openai/response_attrs.go and its test file) is correct and unchanged. Pushed an empty commit to retrigger CI.