test(quart): Fix flake caused by flushing spans on segment end

[alexander-alderman-webb]

Description

The background flush on segment end is asynchronous, and spans from different traces are not guaranteed to be ordered.

The error is

_______________ test_span_streaming_quart_auth_user_id[42-True] ________________
tests/integrations/quart/test_quart.py:1118: in test_span_streaming_quart_auth_user_id
    assert segment["attributes"]["user.id"] == user_id
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
E   KeyError: 'user.id'

Analogous to 4ada8f1

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 📊

✅ 117463 passed | ⏭️ 6732 skipped | Total: 124195 | Pass Rate: 94.58% | Execution Time: 420m 19s

📊 Comparison with Base Branch

Metric	Change
Total Tests	📈 +2743
Passed Tests	📈 +2745
Failed Tests	📉 -2
Skipped Tests	—

➖ Removed Tests (1)

View removed tests

• test_binary_content_encoding_mixed_content[False-False]
  • File: tests.integrations.litellm.test_litellm

All tests are passing successfully.

✅ Patch coverage is 100.00%. Project has 2488 uncovered lines.
✅ Project coverage is 90.22%. Comparing base (base) to head (head).

Coverage diff

@@            Coverage Diff             @@
##          main       #PR       +/-##
==========================================
+ Coverage    90.22%    90.22%        —%
==========================================
  Files          193       193         —
  Lines        25433     25433         —
  Branches      9346      9346         —
==========================================
+ Hits         22945     22945         —
- Misses        2488      2488         —
- Partials      1437      1437         —

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