ref(mcp): Inline _get_span_config()

[alexander-alderman-webb]

Description

Remove unnecessary indirection by inlining _get_span_config().

Issues

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]

Codecov Results 📊

✅ 90034 passed | ⏭️ 6302 skipped | Total: 96336 | Pass Rate: 93.46% | Execution Time: 319m 14s

📊 Comparison with Base Branch

Metric	Change
Total Tests	📉 -11
Passed Tests	📉 -11
Failed Tests	—
Skipped Tests	—

All tests are passing successfully.

✅ Patch coverage is 100.00%. Project has 2480 uncovered lines.
❌ Project coverage is 89.62%. Comparing base (base) to head (head).

Coverage diff

@@            Coverage Diff             @@
##          main       #PR       +/-##
==========================================
- Coverage    89.73%    89.62%    -0.11%
==========================================
  Files          192       192         —
  Lines        23823     23898       +75
  Branches      8226      8242       +16
==========================================
+ Hits         21378     21418       +40
- Misses        2445      2480       +35
- Partials      1349      1352        +3

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Generated by Codecov Action

[sentrivana]

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