ref: Unsample on sampler exception

[sentrivana]

As per https://github.com/getsentry/sentry-docs/pull/19189/changes, we should unsample the trace/profile if there's an exception in the user-provided traces_sampler or profiles_sampler.

[github-actions]

Codecov Results 📊

✅ 129647 passed | ⏭️ 7152 skipped | Total: 136799 | Pass Rate: 94.77% | Execution Time: 440m 13s

📊 Comparison with Base Branch

Metric	Change
Total Tests	📉 -255
Passed Tests	📉 -255
Failed Tests	—
Skipped Tests	—

All tests are passing successfully.

✅ Patch coverage is 100.00%. Project has 2549 uncovered lines.
❌ Project coverage is 90.21%. Comparing base (ff7d0b2) to head (fc78d20).

Coverage diff

@@            Coverage Diff             @@
##        master       #PR       +/-##
==========================================
- Coverage    90.23%    90.21%    -0.02%
==========================================
  Files          194       194         —
  Lines        26030     26028        -2
  Branches      9678      9674        -4
==========================================
+ Hits         23487     23479        -8
- Misses        2543      2549        +6
- Partials      1454      1452        -2

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