chore(sqlalchemy): Drop transaction-based tracing

[sentrivana]

Also remove transaction-based tracing support from various DB integration helpers (record_sql_queries, add_query_source) and fix one remaining Django test

Closes PY-2733
Closes #7198

[linear-code]

PY-2733

[github-actions]

Codecov Results 📊

✅ 106811 passed | ⏭️ 5338 skipped | Total: 112149 | Pass Rate: 95.24% | Execution Time: 357m 25s

📊 Comparison with Base Branch

Metric	Change
Total Tests	📈 +6748
Passed Tests	📈 +7889
Failed Tests	—
Skipped Tests	📉 -1141

All tests are passing successfully.

✅ Patch coverage is 89.47%. Project has 2249 uncovered lines.
✅ Project coverage is 90.46%. Comparing base (base) to head (head).

Files with missing lines (2)

File	Patch %	Lines
sentry_sdk/integrations/sqlalchemy.py	84.62%	⚠️ 2 Missing and 3 partials
sentry_sdk/tracing_utils.py	100.00%	⚠️ 1 partials

Coverage diff

@@            Coverage Diff             @@
##          main       #PR       +/-##
==========================================
+ Coverage    90.30%    90.46%    +0.16%
==========================================
  Files          193       185        -8
  Lines        25689     23577     -2112
  Branches      9480      8652      -828
==========================================
+ Hits         23198     21328     -1870
- Misses        2491      2249      -242
- Partials      1442      1365       -77

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