test: Remove flaky no cyclic garbage test

[alexander-alderman-webb]

Description

The test flakes on 3.14t, and our test suite is not responsible for testing garbage collection details.

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 📊

✅ 91185 passed | ⏭️ 6302 skipped | Total: 97487 | Pass Rate: 93.54% | Execution Time: 323m 29s

📊 Comparison with Base Branch

Metric	Change
Total Tests	📉 -15
Passed Tests	📉 -15
Failed Tests	—
Skipped Tests	—

All tests are passing successfully.

✅ Patch coverage is 100.00%. Project has 2437 uncovered lines.
✅ Project coverage is 89.8%. Comparing base (base) to head (head).

Coverage diff

@@            Coverage Diff             @@
##          main       #PR       +/-##
==========================================
+ Coverage    89.77%    89.80%    +0.03%
==========================================
  Files          193       193         —
  Lines        23898     23898         —
  Branches      8258      8258         —
==========================================
+ Hits         21454     21461        +7
- Misses        2444      2437        -7
- Partials      1353      1353         —

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