fix(aiohttp): Gate request body collection on data_collection experiment

[ericapisani]

Only attach the raw request body when data collection is disabled or "incoming_request" is included in the http_bodies experiment option. Previously the body was always attached regardless of this setting.

Refs PY-2419
Refs #6283

[linear-code]

PY-2419

[github-actions]

Codecov Results 📊

✅ 117724 passed | ⏭️ 6732 skipped | Total: 124456 | Pass Rate: 94.59% | Execution Time: 430m 50s

📊 Comparison with Base Branch

Metric	Change
Total Tests	📈 +55
Passed Tests	📈 +57
Failed Tests	📉 -2
Skipped Tests	—

➖ Removed Tests (2)

View removed tests

• test_continuous_profiler_auto_start_and_stop_sampled[non-experiment-gevent]
  • File: tests.profiler.test_continuous_profiler
• test_continuous_profiler_auto_start_and_stop_sampled_span_streaming[experiment-gevent]
  • File: tests.profiler.test_continuous_profiler

All tests are passing successfully.

✅ Patch coverage is 100.00%. Project has 2486 uncovered lines.
✅ Project coverage is 90.23%. Comparing base (base) to head (head).

Coverage diff

@@            Coverage Diff             @@
##          main       #PR       +/-##
==========================================
+ Coverage    90.22%    90.23%    +0.01%
==========================================
  Files          193       193         —
  Lines        25435     25439        +4
  Branches      9346      9350        +4
==========================================
+ Hits         22947     22953        +6
- Misses        2488      2486        -2
- Partials      1434      1433        -1

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