feat(openai-agents): Support data_collection config for input/output gating

[ericapisani]

Add support for the data_collection experimental feature to control whether
request inputs and response outputs are collected in OpenAI agents spans.

The data_collection setting takes precedence over send_default_pii:

• data_collection.gen_ai.inputs/outputs explicitly controls collection
• When data_collection is omitted, falls back to send_default_pii

Refs PY-2588

[linear-code]

PY-2588

[github-actions]

Codecov Results 📊

✅ 101564 passed | ⏭️ 6677 skipped | Total: 108241 | Pass Rate: 93.83% | Execution Time: 356m 21s

📊 Comparison with Base Branch

Metric	Change
Total Tests	📈 +1980
Passed Tests	📈 +1974
Failed Tests	—
Skipped Tests	📈 +6

All tests are passing successfully.

✅ Patch coverage is 100.00%. Project has 2500 uncovered lines.
✅ Project coverage is 90.04%. Comparing base (base) to head (head).

Coverage diff

@@            Coverage Diff             @@
##          main       #PR       +/-##
==========================================
+ Coverage    90.02%    90.04%    +0.02%
==========================================
  Files          193       193         —
  Lines        25074     25112       +38
  Branches      9066      9100       +34
==========================================
+ Hits         22574     22612       +38
- Misses        2500      2500         —
- Partials      1438      1439        +1

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