test(litellm): Replace mocks with httpx types in rate-limit test

[alexander-alderman-webb]

Description

Issues

Reminders

• Please add tests to validate your changes, and lint your code using tox -e linters.
• Add GH Issue ID & Linear ID (if applicable)
• PR title should use conventional commit style (feat:, fix:, ref:, meta:)
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Codecov Results 📊

✅ 2097 passed | ⏭️ 154 skipped | Total: 2251 | Pass Rate: 93.16% | Execution Time: 6m 35s

📊 Comparison with Base Branch

Metric	Change
Total Tests	📈 +147
Passed Tests	📈 +361
Failed Tests	—
Skipped Tests	📉 -214

All tests are passing successfully.

✅ Patch coverage is 100.00%. Project has 12232 uncovered lines.
✅ Project coverage is 41.97%. Comparing base (base) to head (head).

Coverage diff

@@            Coverage Diff             @@
##          main       #PR       +/-##
==========================================
+ Coverage    40.50%    41.97%    +1.47%
==========================================
  Files          190       190         —
  Lines        20926     21079      +153
  Branches      7692      6886      -806
==========================================
+ Hits          8475      8847      +372
- Misses       12451     12232      -219
- Partials       438       447        +9

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Generated by Codecov Action

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Semver Impact of This PR

🟢 Patch (bug fixes)

📋 Changelog Preview

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Entries from this PR are highlighted with a left border (blockquote style).

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New Features ✨

• (integrations) Instrument pyreqwest tracing by servusdei2018 in #5682
• (litellm) Add async callbacks by alexander-alderman-webb in #5969

Bug Fixes 🐛

• (litellm) Avoid double span exits when streaming by alexander-alderman-webb in #5933

Internal Changes 🔧

Litellm

• Replace mocks with httpx types in rate-limit test by alexander-alderman-webb in #5971

• Replace mocks with httpx types in nonstreaming completion() tests by alexander-alderman-webb in #5937

Other

• (opentelemetry) Ignore mypy error by alexander-alderman-webb in #5927

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