[sentrivana]

Description

If there's an incoming sampling decision, traces_sample_rate is irrelevant and shouldn't overwrite the sampling rate in the DSC.

There are cases where we do want to override the incoming sampling decision, but only in cases where the SDK actually uses a different sample rate for some reason (traces_sampler).

Issues

Closes #8182

Reminders

• Please add tests to validate your changes, and lint your code using uv run ruff.
• Add GH Issue ID & Linear ID (if applicable)
• PR title should use conventional commit style (feat:, fix:, ref:, meta:)
• For external contributors: CONTRIBUTING.md, Sentry SDK development docs, Discord community

[github-actions]

Coverage Results 📊

✅ 137214 passed | ⏭️ 7456 skipped | Total: 144670 | Pass Rate: 94.85% | Execution Time: 442m 23s

📊 Comparison with Base Branch

Metric	Change
Total Tests	—
Passed Tests	—
Failed Tests	—
Skipped Tests	—

✨ Test counts unchanged from base.

All tests are passing successfully.

✅ Patch coverage is 100.00% (4 of 4 changed executable lines covered; target 80%).
Project statement coverage is 90.32% (down 0.01 percentage points from base (dbc50bd) to head (8a5a066)).

Changed files with executable lines (1)

File	Patch coverage	Changed executable lines
sentry_sdk/scope.py	100.00%	4/4 covered

Coverage diff

@@            Coverage Diff             @@
##        master     #8185       +/-##
==========================================
- Coverage    90.33%    90.32%    -0.01%
==========================================
  Files          203       203         —
  Tracked lines     26905     26907        +2
  Branches     10048     10048         —
==========================================
  Hits         24302     24302         —
- Misses        2603      2605        +2
- Partials      1516      1518        +2

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