ref: Rename _get_current_streamed_span

[sentrivana]

Description

Follow the existing convention of defining the future top-level API functions in traces.py under their future names

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

[sentrivana]

This is aliased to an underscore func on purpose since we don't want to advertise it as importable from the top level api

[github-actions]

Codecov Results 📊

✅ 88644 passed | ⏭️ 6022 skipped | Total: 94666 | Pass Rate: 93.64% | Execution Time: 289m 51s

📊 Comparison with Base Branch

Metric	Change
Total Tests	📈 +194
Passed Tests	📈 +192
Failed Tests	—
Skipped Tests	📈 +2

All tests are passing successfully.

✅ Patch coverage is 100.00%. Project has 2468 uncovered lines.
✅ Project coverage is 89.39%. Comparing base (base) to head (head).

Files with missing lines (1)

File	Patch %	Lines
sentry_sdk/integrations/celery/init.py	100.00%	⚠️ 1 partials

Coverage diff

@@            Coverage Diff             @@
##          main       #PR       +/-##
==========================================
+ Coverage    89.39%    89.39%        —%
==========================================
  Files          192       192         —
  Lines        23264     23265        +1
  Branches      7996      7996         —
==========================================
+ Hits         20796     20797        +1
- Misses        2468      2468         —
- Partials      1308      1308         —

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