chore: Drop dual tracing helpers

[sentrivana]

• Remove Spans from type annotations in integrations
• Remove helpers like set_on_span, set_span_data_attribute

Taking at least some stuff out of #7468 to make it more reviewable

[github-actions]

Codecov Results 📊

✅ 67586 passed | ⏭️ 3304 skipped | Total: 70890 | Pass Rate: 95.34% | Execution Time: 214m 41s

📊 Comparison with Base Branch

Metric	Change
Total Tests	📉 -68076
Passed Tests	📉 -64249
Failed Tests	—
Skipped Tests	📉 -3827

All tests are passing successfully.

✅ Patch coverage is 97.10%. Project has 2708 uncovered lines.
❌ Project coverage is 87.86%. Comparing base (a97f270) to head (6081103).

Files with missing lines (1)

File	Patch %	Lines
sentry_sdk/integrations/google_genai/utils.py	50.00%	⚠️ 2 Missing

Coverage diff

@@            Coverage Diff             @@
##        master       #PR       +/-##
==========================================
- Coverage    90.18%    87.86%    -2.32%
==========================================
  Files          193       181       -12
  Lines        25790     22310     -3480
  Branches      9532      8114     -1418
==========================================
+ Hits         23258     19602     -3656
- Misses        2532      2708      +176
- Partials      1432      1237      -195

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