fix: Do not let exceptions in before_breadcrumb bubble up

[sentrivana]

If there's a problem in before_breadcrumb, it could take down the whole app.

[github-actions]

Codecov Results 📊

✅ 99265 passed | ⏭️ 6479 skipped | Total: 105744 | Pass Rate: 93.87% | Execution Time: 355m 11s

📊 Comparison with Base Branch

Metric	Change
Total Tests	📈 +15
Passed Tests	📈 +16
Failed Tests	📉 -1
Skipped Tests	—

➖ Removed Tests (1)

View removed tests

• test_trace_decorator_no_trx
  • File: tests.tracing.test_decorator

All tests are passing successfully.

✅ Patch coverage is 100.00%. Project has 2500 uncovered lines.
✅ Project coverage is 90.02%. Comparing base (base) to head (head).

Coverage diff

@@            Coverage Diff             @@
##          main       #PR       +/-##
==========================================
+ Coverage    89.99%    90.02%    +0.03%
==========================================
  Files          193       193         —
  Lines        24974     25048       +74
  Branches      9008      9036       +28
==========================================
+ Hits         22473     22548       +75
- Misses        2501      2500        -1
- Partials      1437      1442        +5

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