chore(tornado): Remove transaction-based tracing

[sentrivana]

Best viewed with Ignore whitespace.

There were some tests that were not fully migrated to span streaming yet, so I adapted them.

Closes #7119

[github-actions]

Codecov Results 📊

✅ 99318 passed | ⏭️ 5393 skipped | Total: 104711 | Pass Rate: 94.85% | Execution Time: 344m 26s

📊 Comparison with Base Branch

Metric	Change
Total Tests	📉 -6368
Passed Tests	📉 -5084
Failed Tests	—
Skipped Tests	📉 -1284

All tests are passing successfully.

✅ Patch coverage is 100.00%. Project has 2268 uncovered lines.
✅ Project coverage is 90.48%. Comparing base (base) to head (head).

Files with missing lines (1)

File	Patch %	Lines
sentry_sdk/integrations/tornado.py	100.00%	⚠️ 3 partials

Coverage diff

@@            Coverage Diff             @@
##          main       #PR       +/-##
==========================================
+ Coverage    90.14%    90.48%    +0.34%
==========================================
  Files          193       185        -8
  Lines        25183     23821     -1362
  Branches      9176      8724      -452
==========================================
+ Hits         22700     21553     -1147
- Misses        2483      2268      -215
- Partials      1429      1374       -55

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