ci: Remove setuptools from requirements-testing.txt

[alexander-alderman-webb]

Description

Remove the package from requirements-testing.txt and add the package as a dependency to only the test suites that rely on the package (if applicable).

This is part of environment cleanup before moving the remaining testing dependencies to a uv dependency group.

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 📊

✅ 90151 passed | ⏭️ 6305 skipped | Total: 96456 | Pass Rate: 93.46% | Execution Time: 314m 35s

📊 Comparison with Base Branch

Metric	Change
Total Tests	📉 -1
Passed Tests	📈 +5
Failed Tests	📉 -6
Skipped Tests	—

➖ Removed Tests (4)

View removed tests

• test_async_transport_rate_limiting_with_concurrency
  • File: tests.test_transport
• test_standalone_span_iter_headers
  • File: tests.tracing.test_propagation
• test_span_in_span_iter_headers
  • File: tests.tracing.test_propagation
• test_sampling_decided_only_for_transactions
  • File: tests.tracing.test_sampling

All tests are passing successfully.

✅ Patch coverage is 100.00%. Project has 2400 uncovered lines.
❌ Project coverage is 89.92%. Comparing base (base) to head (head).

Coverage diff

@@            Coverage Diff             @@
##          main       #PR       +/-##
==========================================
- Coverage    89.95%    89.92%    -0.03%
==========================================
  Files          192       192         —
  Lines        23809     23809         —
  Branches      8218      8218         —
==========================================
+ Hits         21415     21409        -6
- Misses        2394      2400        +6
- Partials      1339      1339         —

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Generated by Codecov Action

[ericapisani]

LGTM