feat(quart): Add span streaming support to Quart integration

[ericapisani]

Add span streaming support for the Quart integration when the
trace_lifecycle stream experiment is enabled. Sets HTTP request
attributes (method, headers, URL, query, client IP) on the segment
span and uses the correct source constant from sentry_sdk.traces
for span-first mode.

Depends on #6501
being merged first.

Fixes PY-2352
Fixes #6050

[linear-code]

PY-2352

[github-actions]

Codecov Results 📊

✅ 88506 passed | ⏭️ 6022 skipped | Total: 94528 | Pass Rate: 93.63% | Execution Time: 297m 57s

📊 Comparison with Base Branch

Metric	Change
Total Tests	📈 +80
Passed Tests	📈 +80
Failed Tests	—
Skipped Tests	—

All tests are passing successfully.

✅ Patch coverage is 100.00%. Project has 2474 uncovered lines.
✅ Project coverage is 89.38%. Comparing base (base) to head (head).

Files with missing lines (1)

File	Patch %	Lines
sentry_sdk/integrations/quart.py	100.00%	⚠️ 3 partials

Coverage diff

@@            Coverage Diff             @@
##          main       #PR       +/-##
==========================================
+ Coverage    89.37%    89.38%    +0.01%
==========================================
  Files          192       192         —
  Lines        23285     23306       +21
  Branches      8002      8016       +14
==========================================
+ Hits         20811     20832       +21
- Misses        2474      2474         —
- Partials      1309      1312        +3

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