fix(tracing): Take first sentry-trace header in case multiple are supplied

[sl0thentr0py]

Issues

• Resolves: When a Sentry-Trace header is sent erroneously multiple times #6703
• Resolves: PY-2571

[linear-code]

PY-2571

[cursor]

Cursor Bugbot has reviewed your changes and found 1 potential issue.

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[github-actions]

Codecov Results 📊

✅ 90048 passed | ⏭️ 6298 skipped | Total: 96346 | Pass Rate: 93.46% | Execution Time: 312m 46s

📊 Comparison with Base Branch

Metric	Change
Total Tests	📈 +30
Passed Tests	📈 +30
Failed Tests	—
Skipped Tests	—

All tests are passing successfully.

✅ Patch coverage is 80.00%. Project has 2446 uncovered lines.
❌ Project coverage is 89.73%. Comparing base (base) to head (head).

Files with missing lines (1)

File	Patch %	Lines
sentry_sdk/tracing_utils.py	80.00%	⚠️ 1 Missing and 1 partials

Coverage diff

@@            Coverage Diff             @@
##          main       #PR       +/-##
==========================================
- Coverage    89.77%    89.73%    -0.04%
==========================================
  Files          192       192         —
  Lines        23819     23824        +5
  Branches      8222      8226        +4
==========================================
+ Hits         21382     21378        -4
- Misses        2437      2446        +9
- Partials      1347      1351        +4

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