ref: Revert global span batcher limits

[alexander-alderman-webb]

Description

We decided that we'd like to flush a bucket when the segment ends instead of adding global limits.

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 📊

✅ 103894 passed | ⏭️ 6677 skipped | Total: 110571 | Pass Rate: 93.96% | Execution Time: 360m 46s

📊 Comparison with Base Branch

Metric	Change
Total Tests	📉 -90
Passed Tests	📉 -90
Failed Tests	—
Skipped Tests	—

All tests are passing successfully.

✅ Patch coverage is 100.00%. Project has 2476 uncovered lines.
✅ Project coverage is 90.15%. Comparing base (base) to head (head).

Coverage diff

@@            Coverage Diff             @@
##          main       #PR       +/-##
==========================================
+ Coverage    90.15%    90.15%        —%
==========================================
  Files          193       193         —
  Lines        25147     25136       -11
  Branches      9136      9136         —
==========================================
+ Hits         22669     22660        -9
- Misses        2478      2476        -2
- Partials      1431      1431         —

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