feat: Remove early return for NoOpStreamedSpan in set_transaction_name()

[alexander-alderman-webb]

Description

The follow-up PR fails with this otherwise

_ test_catch_exceptions[True-/some_url-ZeroDivisionError-division by zero-tests.integrations.litestar.test_litestar.litestar_app_factory.<locals>.homepage_handler] _
tests/integrations/litestar/test_litestar.py:139: in test_catch_exceptions
    assert expected_tx_name in event["transaction"]
E   AssertionError: assert 'tests.integrations.litestar.test_litestar.litestar_app_factory.<locals>.homepage_handler' in 'http://testserver.local/some_url'

because the ASGI integration sees that the segment source is not set when the span is not sampled.

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 📊

✅ 104531 passed | ⏭️ 6677 skipped | Total: 111208 | Pass Rate: 94% | Execution Time: 360m 5s

📊 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 2483 uncovered lines.
✅ Project coverage is 90.14%. Comparing base (base) to head (head).

Coverage diff

@@            Coverage Diff             @@
##          main       #PR       +/-##
==========================================
+ Coverage    90.13%    90.14%    +0.01%
==========================================
  Files          193       193         —
  Lines        25189     25187        -2
  Branches      9180      9178        -2
==========================================
+ Hits         22704     22704         —
- Misses        2485      2483        -2
- Partials      1432      1430        -2

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