feat(openai): Gate Chat Completions inputs behind data collection

[ericapisani]

Apply data_collection.gen_ai.inputs to Chat Completions prompt messages,
system instructions, and tool definitions, matching the Responses API.
Preserve legacy send_default_pii behavior when data collection is not configured.

Refs PY-2588

[linear-code]

PY-2588

[github-actions]

Codecov Results 📊

✅ 100250 passed | ⏭️ 7021 skipped | Total: 107271 | Pass Rate: 93.45% | Execution Time: 355m 29s

📊 Comparison with Base Branch

Metric	Change
Total Tests	📈 +10024
Passed Tests	📈 +9305
Failed Tests	—
Skipped Tests	📈 +719

All tests are passing successfully.

✅ Patch coverage is 100.00%. Project has 2496 uncovered lines.
✅ Project coverage is 89.92%. Comparing base (base) to head (head).

Files with missing lines (1)

File	Patch %	Lines
sentry_sdk/integrations/openai.py	100.00%	⚠️ 2 partials

Coverage diff

@@            Coverage Diff             @@
##          main       #PR       +/-##
==========================================
+ Coverage    89.88%    89.92%    +0.04%
==========================================
  Files          193       193         —
  Lines        24747     24763       +16
  Branches      8858      8884       +26
==========================================
+ Hits         22242     22267       +25
- Misses        2505      2496        -9
- Partials      1416      1414        -2

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