test: Remove flaky circular references tests

[alexander-alderman-webb]

Description

Tests should not rely on garbage collection details, as it isn't our job to test the garbage collector.

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 📊

✅ 98711 passed | ⏭️ 6806 skipped | Total: 105517 | Pass Rate: 93.55% | Execution Time: 348m 54s

📊 Comparison with Base Branch

Metric	Change
Total Tests	📉 -19
Passed Tests	📉 -16
Failed Tests	📉 -3
Skipped Tests	—

➖ Removed Tests (1)

View removed tests

• test_circular_references_span_streaming
  • File: tests.tracing.test_misc

All tests are passing successfully.

✅ Patch coverage is 100.00%. Project has 2562 uncovered lines.
✅ Project coverage is 89.55%. Comparing base (base) to head (head).

Coverage diff

@@            Coverage Diff             @@
##          main       #PR       +/-##
==========================================
+ Coverage    89.55%    89.55%        —%
==========================================
  Files          193       193         —
  Lines        24520     24520         —
  Branches      8676      8676         —
==========================================
+ Hits         21958     21958         —
- Misses        2562      2562         —
- Partials      1402      1402         —

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