feat(falcon): Set name and source on request span when streaming

[alexander-alderman-webb]

Description

Call Scope.set_transaction_name() on the current scope in process_resource() to change the name and source of the segment span when span streaming is enabled.

Issues

Closes#6019

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

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[github-actions]

Codecov Results 📊

✅ 90848 passed | ⏭️ 6037 skipped | Total: 96885 | Pass Rate: 93.77% | Execution Time: 321m 10s

📊 Comparison with Base Branch

Metric	Change
Total Tests	—
Passed Tests	—
Failed Tests	—
Skipped Tests	—

✨ No test changes detected

All tests are passing successfully.

✅ Patch coverage is 100.00%. Project has 2421 uncovered lines.
❌ Project coverage is 89.75%. Comparing base (base) to head (head).

Coverage diff

@@ Coverage Diff @@## main #PR +/-##
==========================================
- Coverage 89.78% 89.75% -0.03%
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Files 192 192 —
Lines 23620 23630 +10
Branches 8132 8134 +2
==========================================
+ Hits 21206 21209 +3- Misses 2414 2421 +7- Partials 1340 1340 —

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Generated by Codecov Action

[ericapisani]

One question, but otherwise LGTM