fix(starlette): Use url transaction source for host routing

[mjq]

Description

When host routing, we don't have a route and instead fall back to the request path for the transaction name. This should be given transaction source url (for raw URLs) instead of the current value of route (for parameterized routes).

This matters for #7183, where the mis-categorized transaction source would lead to bad data in http.route. (Bug found by Cursor in #7183 (comment) when reviewing that PR).

[cursor]

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^{Reviewed by Cursor Bugbot for commit 563ea47. Configure here.}

[github-actions]

Codecov Results 📊

✅ 118306 passed | ⏭️ 6732 skipped | Total: 125038 | Pass Rate: 94.62% | Execution Time: 414m 56s

📊 Comparison with Base Branch

Metric	Change
Total Tests	📈 +11
Passed Tests	📈 +12
Failed Tests	📉 -1
Skipped Tests	—

➖ Removed Tests (1)

View removed tests

• test_continuous_profiler_auto_start_and_stop_sampled[non-experiment-gevent]
  • File: tests.profiler.test_continuous_profiler

All tests are passing successfully.

✅ Patch coverage is 85.71%. Project has 2486 uncovered lines.
✅ Project coverage is 90.24%. Comparing base (base) to head (head).

Files with missing lines (1)

File	Patch %	Lines
sentry_sdk/integrations/starlette.py	85.71%	⚠️ 1 Missing

Coverage diff

@@            Coverage Diff             @@
##          main       #PR       +/-##
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+ Coverage    90.24%    90.24%        —%
==========================================
  Files          193       193         —
  Lines        25474     25473        -1
  Branches      9378      9378         —
==========================================
+ Hits         22988     22987        -1
- Misses        2486      2486         —
- Partials      1431      1431         —

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